10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 _________________________________________________________

FORM 10-K

 _________________________________________________________

(Mark One)

x Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2012

or

o Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from toto

Commission file number 001-34626

   _________________________________________________________

PIEDMONT OFFICE REALTY TRUST, INC.

(Exact name of registrant as specified in its charter)

 __________________________________________________________

Maryland	58-2328421
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)
11695 Johns Creek Parkway Ste. 350, Johns Creek, Georgia	30097
(Address of principal executive offices)	(Zip Code)

(770) 418-8800

Registrant’s telephone number, including area code

    _________________________________________________________

Securities registered pursuant to Section 12 (b) of the Act:

Title of each class	Name of exchange on which registered
COMMON STOCK	NEW YORK STOCK EXCHANGE

Securities registered pursuant to Section 12 (g) of the Act:

None

(Title of Class)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Yes  x    No  o

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

Yes  o    No  x

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 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 if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company (as defined in Rule 12b-2 of the Act).

Large accelerated filer  x       Accelerated filer  o        Non-accelerated filer  o        Smaller reporting companyo

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

As of June 29, 2012, the aggregate market value of the common stock of Piedmont Office Realty Trust, Inc., held by non-affiliates was $2,916,495,257 based on the closing price as reported on the New York Stock Exchange. As of February 26, 2013, 167,555,401 shares of common stock were outstanding.

Documents Incorporated by Reference:

Registrant incorporates by reference portions of the Piedmont Office Realty Trust, Inc. Definitive Proxy Statement for the 2013 Annual Meeting of Stockholders (Items 10, 11, 12, 13, and 14 of Part III) to be filed no later than April 30, 2013.

		FORM 10-K
		PIEDMONT OFFICE REALTY TRUST, INC.
		TABLE OF CONTENTS
PART I.			Page No.
	Item 1.	Business	2
	Item 1A.	Risk Factors	4
	Item 1B.	Unresolved Staff Comments	19
	Item 2.	Properties	19
	Item 3.	Legal Proceedings	23
	Item 4.	Mine Safety Disclosures	24
PART II.
	Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	25
	Item 6.	Selected Financial Data	28
	Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	29
	Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	41
	Item 8.	Financial Statements and Supplementary Data	43
	Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	43
	Item 9A.	Controls and Procedures	43
	Item 9B.	Other Information	44
PART III.
	Item 10.	Directors, Executive Officers and Corporate Governance	45
	Item 11.	Executive Compensation	45
	Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	45
	Item 13.	Certain Relationships and Related Transactions, and Director Independence	45
	Item 14.	Principal Accounting Fees and Services	45
PART IV.
	Item 15.	Exhibits, Financial Statement Schedules	46
	Signatures		47

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

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

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

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

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

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

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

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

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

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

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

• Costs of complying with governmental laws and regulations;

• Uncertainties associated with environmental and other regulatory matters;

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

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

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

• Other factors, including the risk factors discussed under Item 1A. of this Annual Report on Form 10-K.

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.

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PART I

ITEM 1.    BUSINESS

General

Piedmont Office Realty Trust, Inc. (“Piedmont”) (NYSE: PDM) is a Maryland corporation that operates in a manner so as to qualify as a real estate investment trust (“REIT”) for federal income tax purposes and engages in the acquisition and ownership of commercial real estate properties throughout the United States, including properties that are under construction, are newly constructed, or have operating histories. Piedmont was incorporated in 1997, commenced operations in 1998, and listed its common stock on the New York Stock Exchange ("NYSE") in 2010. 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 is the sole general partner of Piedmont OP and possesses full legal control and authority over the operations of Piedmont OP. Piedmont OP owns properties directly, through wholly-owned subsidiaries and through both consolidated and unconsolidated joint ventures. References to Piedmont herein shall include Piedmont and all of its subsidiaries, including Piedmont OP and its subsidiaries and joint ventures.

Operating Objectives and Strategy

Based on its December 31, 2012 equity market capitalization of $3.0 billion, Piedmont is the fifth largest office REIT in the United States based on comparison to the constituents of the Bloomberg U.S. Office REIT Index.

Our portfolio consists primarily of Class A commercial office buildings leased to large, credit-worthy, government and corporate tenants. As of December 31, 2012, approximately 82% of our Annualized Lease Revenue (see "Information Regarding Disclosures Presented"below) was derived from our office properties in the ten largest U.S. office markets based on rentable square footage, including premier office markets such as Chicago, Washington, D.C., the New York metropolitan area, Boston and greater Los Angeles.

For the past several years, we have been reducing the number of markets we operate within by selling non-strategic assets and recycling the proceeds into assets and markets which we believe have the greatest potential to contribute to enterprise value over time. Since 2005 we have exited twenty markets and plan to exit up to an additional seven over the next few years so that we are predominantly concentrated in the top ten U.S. office markets by 2015. During 2012 we disposed of seven properties, which allowed us to exit two geographical markets as well as dispose of our last two industrial assets. We have a demonstrated capital allocation track record including transacting $5.9 billion and $1.7 billion in property acquisitions and dispositions, respectively, during our fourteen year operating history. As we are disciplined investors and found pricing of potential replacement assets during 2012 to be prohibitive, we reinvested the majority of the proceeds from our recent dispositions into the stock repurchase program authorized by our Board of Directors in 2011. Piedmont has maintained a low-leverage strategy (typically around 30% of gross asset value) which allows capacity for growth as transactional opportunities arise.

Headquartered in metropolitan Atlanta, Georgia, with local management offices in each of its major markets, Piedmont values operational excellence and was tied for second overall and tied for first for REITs based on the number of buildings owned and managed with Building Owners Management Association ("BOMA") 360 designations. BOMA 360 is a program that evaluates six major areas of building operations and management and benchmarks a building's performance against industry standards. The achievement of such a designation recognizes excellence in building operations and management. We also have focused on environmental sustainability initiatives at our properties, and approximately 79% of our office portfolio (based on Annualized Lease Revenue) maintains Energy Star labels as of December 31, 2012.

We foster long-term relationships with our high-credit quality, diverse tenant base as evidenced by our 75% tenant retention rate over the past seven years. No tenant other than the U.S. government accounts for more than 6% of our Annualized Lease Revenue, and 66% of our Annualized Lease Revenue is derived from investment grade companies or government agencies.

Information Regarding Disclosures Presented

Annualized Lease Revenue ("ALR") 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 have 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

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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 our five unconsolidated joint venture interests.

Employees

As of December 31, 2012, we had 116 full-time employees, with 54 of our employees working in our corporate office in Johns Creek, Georgia. Our remaining employees work in property management offices located in Atlanta, Georgia; Boston, Massachusetts; Minneapolis, Minnesota; Washington, D.C.; Tampa, Florida; Irving, Texas; Houston, Texas; Chicago, Illinois; Detroit, Michigan; and the metropolitan areas surrounding New York, New York and Los Angeles, California. These employees are involved in managing our real estate and servicing our tenants.

Competition

We compete for tenants for our high-quality assets in major U.S. markets by fostering strong tenant relationships and by providing efficient customer service including, asset management, property management, and construction management services. As the competition for high-credit-quality tenants is intense, we may be required to provide rent abatements, incur charges for tenant improvements and other concessions, or we may not be able to lease vacant space timely, all of which would adversely impact our results of operations. We compete with other buyers who are interested in properties we elect to acquire, which may result in an increase in the amount that we pay for such properties or may ultimately result in our inability to acquire such properties. We also compete with sellers of similar properties when we sell properties, which may result in our receiving lower proceeds from the disposal, or which may result in our inability to dispose of such properties due to the lack of an acceptable return.

Financial Information About Industry Segments

Our current business consists primarily of owning, managing, operating, leasing, acquiring, developing, investing in, and disposing of office real estate assets. We internally evaluate all of our real estate assets as one operating segment, and, accordingly, we do not report segment information.

Concentration of Credit Risk

We are dependent upon the ability of our current tenants to pay their contractual rent amounts as the rents become due. The inability of a tenant to pay future rental amounts would have a negative impact on our results of operations. As of December 31, 2012, no individual tenant, other than multiple leases which collectively represent various departments of the federal government, represents more than 10% of our future rental income under non-cancelable leases or 10% of our current year rental income. Apart from general uncertainties related to current, adverse economic conditions, and governmental operating deficits, we are not aware of any reason that our current tenants will be unable to pay their contractual rental amounts, in all material respects, as they become due. If certain situations prevent our tenants from paying contractual rents, this could result in a material adverse impact on our results of operations.

Other Matters

Piedmont has contracts with various governmental agencies, exclusively in the form of operating leases in buildings we own. See Item 1A. “Risk Factors” for further discussion of the risks associated with these contracts.

Additionally, as the owner of real estate assets, we are subject to environmental risks. See Item 1A. “Risk Factors” for further discussion of the risks associated with environmental concerns.

Web Site Address

Access to copies of each of our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, proxy statements, and other filings with the Securities and Exchange Commission (the "SEC"), including any amendments to such filings, may be obtained free of charge from the following Web site, http://www.piedmontreit.com, or directly from the SEC’s Web site at http://www.sec.gov. These filings are available promptly after we file them with, or furnish them to, the SEC.

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ITEM 1A.    RISK FACTORS

Risks Related to Our Business and Operations

Market and economic conditions remain challenging and the demand for office space, rental rates and property values may continue to lag the general economic recovery causing our business, results of operations, cash flows, and financial condition to be adversely affected.

The United States economy remains fragile and continuing concerns about the potential impact of higher taxes, inflation, government deficit spending, and rising interest rates continue to temper widespread job growth in the United States. As the demand for office space is highly dependent on job growth, rental rates and property values may continue to lag the general economic recovery. If we are unable to attract new tenants, renew existing tenants, or experience terminations or defaults on in-place leases, then our cash flow, results of operations, financial condition, and the market price of our common stock may suffer. If we do not have sufficient cash flow from operations to continue operating our business and are unable to borrow additional funds or are unable to access our existing line of credit, we may need to find alternative ways to increase our liquidity. Such alternatives may include, without limitation, curtailing acquisitions and potential development activity, decreasing our distribution levels, disposing of one or more of our properties possibly on disadvantageous terms, or entering into or renewing leases on less favorable terms than we otherwise would.

Our growth will partially depend upon future acquisitions of properties, and we may not be successful in identifying and consummating suitable acquisitions that meet our investment criteria, which may impede our growth and negatively affect our results of operations.

Our business strategy involves the acquisition of primarily high-quality office properties in selected markets. These activities require us to identify suitable acquisition candidates or investment opportunities that meet our criteria and are compatible with our growth strategy. We may not be successful in identifying suitable properties or other assets that meet our acquisition criteria or in consummating acquisitions on satisfactory terms, if at all. Failure to identify or consummate acquisitions could slow our growth.

Further, we face significant competition for attractive investment opportunities from an indeterminate number of other real estate investors, including investors with significant capital resources such as domestic and foreign corporations and financial institutions, publicly traded and privately held REITs, private institutional investment funds, investment banking firms, life insurance companies and pension funds. As a result of competition, we may be unable to acquire additional properties as we desire, the purchase price may be significantly elevated, or we may have to accept lease-up risk for a property with lower occupancy which could adversely affect our financial condition, results of operations, cash flows and ability to pay distributions on, and the market price of, our common stock.

We depend on tenants for our revenue, and accordingly, lease terminations and/or tenant defaults, particularly by one of our significant lead tenants, could adversely affect the income produced by our properties, which may harm our operating performance, thereby limiting our ability to make distributions to our stockholders.

The success of our investments materially depends on the financial stability of our tenants, any of whom may experience a change in their business at any time. As a result, our tenants may delay lease commencements, decline to extend or renew their leases upon expiration, fail to make rental payments when due, or declare bankruptcy. Any of these actions could result in the termination of the tenants’ leases, or expiration of existing leases without renewal, and the loss of rental income attributable to the terminated or expired leases. In the event of a tenant default or bankruptcy, we may experience delays in enforcing our rights as a landlord and may incur substantial costs in protecting our investment and re-letting our property. If significant leases are terminated or defaulted upon, we may be unable to lease the property for the rent previously received or sell the property without incurring a loss. In addition, significant expenditures, related to mortgage payments, real estate taxes, insurance, and maintenance costs, are generally fixed and do not decrease when revenues at the related property decrease.

The occurrence of any of the situations described above, particularly if it involves one of our significant lead tenants, could seriously harm our operating performance. As of December 31, 2012, our most substantial non-U.S. governmental lead tenants, based on ALR, were BP Corporation (approximately 5.9%), US Bancorp (approximately 5.0%), and the State of New York (approximately 3.6%). As lead tenants, the revenues generated by the properties these tenants occupy are substantially dependent upon the financial condition of these tenants and, accordingly, any event of bankruptcy, insolvency, or a general downturn in the business of any of these tenants may result in the failure or delay of such tenant’s rental payments, which may have a substantial adverse effect on our operating performance.

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We face considerable competition in the leasing market and may be unable to renew existing leases or re-let space on terms similar to the existing leases, or we may expend significant capital in our efforts to re-let space, which may adversely affect our operating results.

We have been working through a period of intense releasing activity over the past several years due to the fact that many of our properties were acquired approximately ten years ago with typically seven to ten years of lease term remaining. As a result a significant number of leases expired during the last three years. Every year, we compete with a number of other developers, owners, and operators of office and office-oriented, mixed-use properties to renew leases with our existing tenants and to attract new tenants. To the extent that we are able to renew leases that are scheduled to expire in the short-term or re-let such space to new tenants, heightened competition resulting from adverse market conditions may require us to utilize rent concessions and tenant improvements to a greater extent than we historically have. In addition, competition for credit worthy tenants remains intense and we may have difficulty competing with competitors who have purchased properties at discounted prices allowing them to offer space at reduced rental rates.

If our competitors offer space at rental rates below current market rates or below the rental rates we currently charge our tenants, we may lose potential tenants, and we may be pressured to reduce our rental rates below those we currently charge in order to retain tenants upon expiration of their existing leases. Even if our tenants renew their leases or we are able to re-let the space, the terms and other costs of renewal or re-letting, including the cost of required renovations, increased tenant improvement allowances, leasing commissions, declining rental rates, and other potential concessions, may be less favorable than the terms of our current leases and could require significant capital expenditures. If we are unable to renew leases or re-let space in a reasonable time, or if rental rates decline or tenant improvement, leasing commissions, or other costs increase, our financial condition, cash flows, cash available for distribution, value of our common stock, and ability to satisfy our debt service obligations could be adversely affected.

Some of our leases provide tenants with the right to terminate their leases early, which could have an adverse effect on our cash flow and results of operations.

Certain of our leases permit our tenants to terminate their leases of all or a portion of the leased premises prior to their stated lease expiration dates under certain circumstances, such as providing notice by a certain date and, in many cases, paying a termination fee. In certain cases, such early terminations can be effectuated by our tenants with little or no termination fee being paid to us. As of December 31, 2012, approximately 2.3% of our ALR was comprised of leases that provided tenants with early termination rights (including partial terminations and terminations of whole leases) that could be effected during the subsequent twelve month period. Leases comprising approximately 2.2% of such ALR would require the tenant to pay a termination fee, while 0.1% of such ALR would not require a termination fee upon execution. To the extent that our tenants exercise early termination rights, our cash flow and earnings will be adversely affected, and we can provide no assurances that we will be able to generate an equivalent amount of net rental income by leasing the vacated space to new third party tenants.

Our rental revenues will be significantly influenced by the economies and other conditions of the office market in general and of the specific markets in which we operate, particularly in Chicago, Washington, D.C., and the New York metropolitan area, where we have high concentrations of office properties.

Because our portfolio consists of office properties, we are subject to risks inherent in investments in a single property type. This concentration exposes us to the risk of economic downturns in the office sector to a greater extent than if our portfolio also included other sectors of the real estate industry. Our properties located in Chicago, Washington, D.C. and the New York metropolitan area account for approximately 23.1%, 22.0%, and 14.6%, respectively, of our ALR. As a result, we are particularly susceptible to adverse market conditions in these particular areas, including the reduction in demand for office properties, industry slowdowns, governmental cut backs, relocation of businesses and changing demographics. Adverse economic or real estate developments in the markets in which we have a concentration of properties, or in any of the other markets in which we operate, or any decrease in demand for office space resulting from the local or national government and business climates, could adversely affect our rental revenues and operating results.

Economic, regulatory, and/or socio-economic changes that impact the real estate market generally, or that could affect patterns of use of commercial office space, may cause our operating results to suffer and decrease the value of our real estate properties.

The investment returns available from equity investments in real estate depend on the amount of income earned and capital appreciation generated by the properties, as well as the expenses incurred in connection with the properties. If our properties do not generate income sufficient to meet operating expenses, including debt service and capital expenditures, then our ability to pay distributions to our stockholders could be adversely affected. In addition, there are significant expenditures associated with an investment in real estate (such as mortgage payments, real estate taxes, and maintenance costs) that generally do not decline when

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circumstances reduce the income from the property. The following factors, among others, may adversely affect the operating performance and long- or short-term value of our properties:

• changes in the national, regional, and local economic climate, particularly in markets in which we have a concentration of properties;

• local office market conditions such as changes in the supply of, or demand for, space in properties similar to those that we own within a particular area;

• changes in the patterns of office use due to technological advances which may make telecommuting more prevalent;

• the attractiveness of our properties to potential tenants;

• changes in interest rates and availability of permanent mortgage funds that may render the sale of a property difficult or unattractive or otherwise reduce returns to stockholders;

• the financial stability of our tenants, including bankruptcies, financial difficulties, or lease defaults by our tenants;

• changes in operating costs and expenses, including costs for maintenance, insurance, and real estate taxes, and our ability to control rents in light of such changes;

• the need to periodically fund the costs to repair, renovate, and re-let space;

• earthquakes, tornadoes, hurricanes and other natural disasters, civil unrest, terrorist acts or acts of war, which may result in uninsured or under insured losses;

• changes in, or increased costs of compliance with, governmental regulations, including those governing usage, zoning, the environment, and taxes; and

• changes in accounting standards.

In addition, periods of economic slowdown or recession, rising interest rates, or declining demand for real estate could result in a general decrease in rents or an increased occurrence of defaults under existing leases, which would adversely affect our financial condition and results of operations. Any of the above factors may prevent us from generating sufficient cash flow or maintaining the value of our real estate properties.

We may face additional risks and costs associated with directly managing properties occupied by government tenants.

We currently own nine properties in which some or all of the tenants are federal government agencies. Lease agreements with these federal government agencies contain certain provisions required by federal law, which require, among other things, that the contractor (which is the lessor or the owner of the property) agree to comply with certain rules and regulations, including but not limited to, rules and regulations related to anti-kickback procedures, examination of records, audits and records, equal opportunity provisions, prohibitions against segregated facilities, certain executive orders, subcontractor costs or pricing data, and certain provisions intending to assist small businesses. Through one of our wholly-owned subsidiaries, we directly manage properties with federal government agency tenants and, therefore, we are subject to additional risks associated with compliance with all such federal rules and regulations. There are certain additional requirements relating to the potential application of the Employment Standards Administration’s Office of Federal Contract Compliance Programs and the related requirement to prepare written affirmative action plans applicable to government contractors and subcontractors. Some of the factors used to determine whether such requirements apply to a company that is affiliated with the actual government contractor (the legal entity that is the lessor under a lease with a federal government agency) include whether such company and the government contractor are under common ownership, have common management, and are under common control. One of our wholly-owned subsidiaries is considered a government contractor, increasing the risk that requirements of these equal opportunity provisions including the requirement to prepare affirmative action plans may be determined to be applicable to us.

Adverse market and economic conditions may adversely affect us and could cause us to recognize impairment charges on tangible real estate and related lease intangible assets or otherwise impact our performance.

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

Projections of expected future cash flows require management to make assumptions to estimate future market rental income amounts subsequent to the expiration of current lease agreements, property operating expenses, the number of months it takes to re-lease the property, and the number of years the property is held for investment, among other factors. The current uncertainty in the U.S. economy increases the subjectivity involved in projecting future cash flows, discount and capitalization rates and other factors involved in these calculations. The subjectivity of assumptions used in the future cash flow analysis, including discount

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rates, could result in an incorrect assessment of the property’s fair value and, therefore, could result in the misstatement of the carrying value of our real estate and related lease intangible assets and our net income. In addition, adverse economic conditions could also cause us to recognize additional asset impairment charges in the future, which could materially and adversely affect our business, financial condition and results of operations.

Adverse market and economic conditions could cause us to recognize impairment charges on our goodwill, or otherwise impact our performance.

We review the value of our goodwill on an annual basis and when events or changes in circumstances indicate that the carrying value of goodwill may exceed the fair value of such assets. Such interim events could be adverse changes in legal matters or in the business climate, adverse action or assessment by a regulator, the loss of key personnel, or persistent declines in an entity’s stock price below carrying value of the entity. Volatility in the overall market could cause the price of our common stock to fluctuate and cause the carrying value of our company to exceed the estimated fair value. If that occurs, our goodwill potentially could be impaired. Impairment charges recognized in order to reduce our goodwill could materially and adversely affect our financial condition and results of operations.

We may invest in mezzanine debt, which is subject to increased risk of loss relative to senior mortgage loans.

We may invest in mezzanine debt. These investments, which are subordinate to the mortgage loans secured by the real property underlying the loan, are generally secured by pledges of the equity interests of the entities owning the underlying real estate. As a result, these investments involve greater risk of loss than investments in senior mortgage loans that are secured by real property since they are subordinate to the mortgage loan secured by the building and may be subordinate to the interests of other mezzanine lenders. Therefore, if the property owner defaults on its debt service obligations payable to us or on debt senior to us, or declares bankruptcy, such mezzanine loans will be satisfied only after the senior debt and the other senior mezzanine loans are paid in full, resulting in the possibility that we may be unable to recover some or all of our investment. In addition, the value of the assets securing or supporting our mezzanine debt investments could deteriorate over time due to factors beyond our control, including acts or omissions by owners, changes in business, economic or market conditions, or foreclosure, any of which could result in the recognition of impairment losses. In addition, there may be significant delays and costs associated with the process of foreclosing on the collateral securing or supporting such investments.

Future acquisitions of properties may not yield anticipated returns, may result in disruptions to our business, and may strain management resources.

We intend to continue acquiring high-quality office properties, subject to the availability of attractive properties and our ability to consummate acquisitions on satisfactory terms. In deciding whether to acquire a particular property, we make certain assumptions regarding the expected future performance of that property. However, newly acquired properties may fail to perform as expected. Costs necessary to bring acquired properties up to standards established for their intended market position may exceed our expectations, which may result in the properties’ failure to achieve projected returns.

In particular, to the extent that we engage in acquisition activities, they will pose the following risks for our ongoing operations:

• we may acquire properties or other real estate-related investments that are not initially accretive to our results upon acquisition or accept lower cash flows in anticipation of longer term appreciation, and we may not successfully manage and lease those properties to meet our expectations;

• we may not achieve expected cost savings and operating efficiencies;

• we may be unable to quickly and efficiently integrate new acquisitions, particularly acquisitions of portfolios of properties, into our existing operations;

• management attention may be diverted to the integration of acquired properties, which in some cases may turn out to be less compatible with our operating strategy than originally anticipated;

• we may not be able to support the acquired property through one of our existing property management offices and may not successfully open new satellite offices to serve additional markets;

• the acquired properties may not perform as well as we anticipate due to various factors, including changes in macro-economic conditions and the demand for office space; and

• we may acquire properties without any recourse, or with only limited recourse, for liabilities, whether known or unknown, such as clean-up of environmental contamination, claims by tenants, vendors or other persons against the former owners of the properties, and claims for indemnification by general partners, directors, officers, and others indemnified by the former owners of the properties.

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We depend on key personnel, each of whom would be difficult to replace.

Our continued success depends to a significant degree upon the continued contributions of certain key personnel including, but not limited to, Donald A. Miller, CFA, Robert E. Bowers, Laura P. Moon, Raymond L. Owens, Carroll A. Reddic, and Robert K. Wiberg, each of whom would be difficult to replace. Our ability to retain our management team, or to attract suitable replacements should any member of the executive management team leave, is dependent on the competitive nature of the employment market. The loss of services of one or more of these key members of our management team could adversely affect our results of operations and slow our future growth. We have not obtained and do not expect to obtain “key person” life insurance on any of our key personnel.

Acquired properties may be located in new markets, where we may face risks associated with investing in an unfamiliar market.

When we acquire properties located in markets in which we do not have an established presence, we may face risks associated with a lack of market knowledge or understanding of the local economy, forging new business relationships in the area and unfamiliarity with local government and permitting procedures. As a result, the operating performance of properties acquired in new markets may be less than we anticipate, and we may have difficulty integrating such properties into our existing portfolio. In addition, the time and resources that may be required to obtain market knowledge and/or integrate such properties into our existing portfolio could divert our management’s attention from our existing business or other attractive opportunities in our concentration markets.

The illiquidity of real estate investments could significantly impede our ability to respond to adverse changes in the performance of our properties.

Because real estate investments are relatively illiquid and large-scale office properties such as many of those in our portfolio are particularly illiquid, our ability to sell promptly one or more properties in our portfolio in response to changing economic, financial, and investment conditions is limited. The real estate market is affected by many forces, such as general economic conditions, availability of financing, interest rates, and other factors, including supply and demand, that are beyond our control. We cannot predict whether we will be able to sell any property for the price or on the terms set by us or whether any price or other terms offered by a prospective purchaser would be acceptable to us. We also cannot predict the length of time needed to find a willing purchaser and to close the sale of a property. We may be required to expend funds to correct defects or to make improvements before a property can be sold. We cannot provide any assurances that we will have funds available to correct such defects or to make such improvements. Our inability to dispose of assets at opportune times or on favorable terms could adversely affect our cash flows and results of operations, thereby limiting our ability to make distributions to stockholders.

Future terrorist attacks in the major metropolitan areas in which we own properties could significantly impact the demand for, and value of, our properties.

Our portfolio maintains significant holdings in markets such as Chicago, Washington, D.C., the New York metropolitan area, Boston, and greater Los Angeles, each of which has been, and continues to be, a high risk geographical area for terrorism and threats of terrorism. Future terrorist attacks and other acts of terrorism or war would severely impact the demand for, and value of, our properties. Terrorist attacks in and around any of the major metropolitan areas in which we own properties also could directly impact the value of our properties through damage, destruction, loss, or increased security costs, and could thereafter materially impact the availability or cost of insurance to protect against such acts. A decrease in demand could make it difficult to renew or re-lease our properties at lease rates equal to or above historical rates. To the extent that any future terrorist attacks otherwise disrupt our tenants’ businesses, it may impair our tenants’ ability to make timely payments under their existing leases with us, which would harm our operating results.

Uninsured losses or losses in excess of our insurance coverage could adversely affect our financial condition and our cash flow, and there can be no assurance as to future costs and the scope of coverage that may be available under insurance policies.

We carry comprehensive general liability, fire, extended coverage, business interruption rental loss coverage, environmental, and umbrella liability coverage on all of our properties and earthquake, wind, and flood coverage on properties in areas where such coverage is warranted. We believe the policy specifications and insured limits of these policies are adequate and appropriate given the relative risk of loss, the cost of the coverage, and industry practice. However, we may be subject to certain types of losses, those that are generally catastrophic in nature, such as losses due to wars, conventional terrorism, chemical, biological, nuclear and radiation (“CBNR”) acts of terrorism and, in some cases, earthquakes, hurricanes, and flooding, either because such coverage is not available or is not available at commercially reasonable rates. If we experience a loss that is uninsured or that exceeds policy limits, we could lose a significant portion of the capital we have invested in the damaged property, as well as the anticipated future revenue from the property. Inflation, changes in building codes and ordinances, environmental considerations, and other factors also might make it impractical or undesirable to use insurance proceeds to replace a property after it has been damaged or destroyed.

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In addition, if the damaged properties are subject to recourse indebtedness, we would continue to be liable for the indebtedness, even if these properties were irreparably damaged. Furthermore, we may not be able to obtain adequate insurance coverage at reasonable costs in the future, as the costs associated with property and casualty renewals may be higher than anticipated.

In addition, insurance risks associated with potential terrorism acts could sharply increase the premiums we pay for coverage against property and casualty claims. With the enactment of the Terrorism Risk Insurance Program Reauthorization Act of 2007 ("TRIA"), United States insurers cannot exclude conventional (non-CBNR) terrorism losses. These insurers must make terrorism insurance available under their property and casualty insurance policies; however, this legislation does not regulate the pricing of such insurance. TRIA is scheduled to expire at the end of 2014, although there are currently discussions regarding extending it. In some cases, mortgage lenders have begun to insist that commercial property owners purchase coverage against terrorism as a condition of providing mortgage loans. Such insurance policies may not be available at a reasonable cost, which could inhibit our ability to finance or refinance our properties. In such instances, we may be required to provide other financial support, either through financial assurances or self-insurance, to cover potential losses. We may not have adequate coverage for such losses.

We have properties located in Southern California, an area especially susceptible to earthquakes. Collectively, these properties represent approximately 5.2% of our ALR. Because these properties are located in close proximity to one another, an earthquake in the greater Los Angeles area could materially damage, destroy or impair the use by tenants of all of these properties. If any of our properties incurs a loss that is not fully insured, the value of that asset will be reduced by such uninsured loss. Also, to the extent we must pay unexpectedly large amounts for insurance, we could suffer reduced earnings that would result in lower distributions to our stockholders.

Should one of our insurance carriers become insolvent, we would be adversely affected.

We carry several different lines of insurance, placed with several large insurance carriers. If any one of these large insurance carriers were to become insolvent, we would be forced to replace the existing insurance coverage with another suitable carrier, and any outstanding claims would be at risk for collection. In such an event, we cannot be certain that we would be able to replace the coverage at similar or otherwise favorable terms. Replacing insurance coverage at unfavorable rates and the potential of uncollectible claims due to carrier insolvency could adversely impact our results of operations and cash flows.

Our current and future joint venture investments could be adversely affected by a lack of sole decision-making authority and our reliance on joint venture partners’ financial condition.

As of December 31, 2012, we owned interests in five properties representing approximately 0.7 million rentable square feet through unconsolidated joint ventures. In the future we may enter into strategic joint ventures with institutional investors to acquire, develop, improve, or dispose of properties, thereby reducing the amount of capital required by us to make investments and diversifying our capital sources for growth. Such joint venture investments involve risks not otherwise present in a wholly-owned property, development, or redevelopment project, including the following:

• in these investments, we do not have exclusive control over the development, financing, leasing, management, and other aspects of the project, which may prevent us from taking actions that are opposed by our joint venture partners;

• joint venture agreements often restrict the transfer of a co-venturer’s interest or may otherwise restrict our ability to sell the interest when we desire or on advantageous terms;

• we would not be in a position to exercise sole decision-making authority regarding the property or joint venture, which could create the potential risk of creating impasses on decisions, such as acquisitions or sales;

• such co-venturer may, at any time, have economic or business interests or goals that are, or that may become, inconsistent with our business interests or goals;

• such co-venturer may be in a position to take action contrary to our instructions, requests, policies or objectives, including our current policy with respect to maintaining our qualification as a REIT;

• the possibility that our co-venturer in an investment might become bankrupt, which would mean that we and any other remaining co-venturers would generally remain liable for the joint venture’s liabilities;

• our relationships with our co-venturers are contractual in nature and may be terminated or dissolved under the terms of the applicable joint venture agreements and, in such event, we may not continue to own or operate the interests or assets underlying such relationship or may need to purchase such interests or assets at a premium to the market price to continue ownership;

• disputes between us and our co-venturers may result in litigation or arbitration that would increase our expenses and prevent our officers and directors from focusing their time and efforts on our business and could result in subjecting the properties owned by the applicable joint venture to additional risk; or

• we may, in certain circumstances, be liable for the actions of our co-venturers, and the activities of a joint venture could adversely affect our ability to qualify as a REIT, even though we do not control the joint venture.

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Any of the above might subject a property to liabilities in excess of those contemplated and thus reduce the returns to our investors.

Costs of complying with governmental laws and regulations may reduce our net income and the cash available for distributions to our stockholders.

All real property and the operations conducted on real property are subject to federal, state, and local laws and regulations relating to environmental protection and human health and safety. Tenants’ ability to operate and to generate income to pay their lease obligations may be affected by permitting and compliance obligations arising under such laws and regulations. Some of these laws and regulations may impose joint and several liability on tenants, owners, or operators for the costs to investigate or remediate contaminated properties, regardless of fault or whether the acts causing the contamination were legal. In addition, the presence of hazardous substances, or the failure to properly remediate these substances, may hinder our ability to sell, rent, or pledge such property as collateral for future borrowings.

Compliance with new laws or regulations or stricter interpretation of existing laws by agencies or the courts may require us to incur material expenditures. Future laws, ordinances, or regulations may impose material environmental liability. Additionally, our tenants’ operations, the existing condition of land when we buy it, operations in the vicinity of our properties such as the presence of underground storage tanks or activities of unrelated third parties may affect our properties. In addition, there are various local, state, and federal fire, health, life-safety, and similar regulations with which we may be required to comply, and which may subject us to liability in the form of fines or damages for noncompliance. Any material expenditures, fines, or damages we must pay will reduce our cash flows and ability to make distributions and may reduce the value of our stockholders’ investment.

As the present or former owner or operator of real property, we could become subject to liability for environmental contamination, regardless of whether we caused such contamination.

Under various federal, state, and local environmental laws, ordinances, and regulations, a current or former owner or operator of real property may be liable for the cost to remove or remediate hazardous or toxic substances, wastes, or petroleum products on, under, from, or in such property. These costs could be substantial and liability under these laws may attach whether or not the owner or operator knew of, or was responsible for, the presence of such contamination. Even if more than one person may have been responsible for the contamination, each liable party may be held entirely responsible for all of the clean-up costs incurred. In addition, third parties may sue the owner or operator of a property for damages based on personal injury, natural resources, or property damage and/or for other costs, including investigation and clean-up costs, resulting from the environmental contamination. The presence of contamination on one of our properties, or the failure to properly remediate a contaminated property, could give rise to a lien in favor of the government for costs it may incur to address the contamination, or otherwise adversely affect our ability to sell or lease the property or borrow using the property as collateral. In addition, if contamination is discovered on our properties, environmental laws may impose restrictions on the manner in which property may be used or businesses may be operated, and these restrictions may require substantial expenditures or prevent us from entering into leases with prospective tenants.

Some of our properties are adjacent to or near other properties that have contained or currently contain underground storage tanks used to store petroleum products or other hazardous or toxic substances. In addition, certain of our properties are on, adjacent to, or near sites upon which others, including former owners or tenants of our properties, have engaged, or may in the future engage, in activities that have released or may have released petroleum products or other hazardous or toxic substances.

The cost of defending against claims of liability, of remediating any contaminated property, or of paying personal injury claims could reduce the amounts available for distribution to our stockholders.

As the owner of real property, we could become subject to liability for adverse environmental conditions in the buildings on our property.

Some of our properties contain asbestos-containing building materials. Environmental laws require that owners or operators of buildings containing asbestos properly manage and maintain the asbestos, adequately inform or train those who may come into contact with asbestos, and undertake special precautions, including removal or other abatement, in the event that asbestos is disturbed during building renovation or demolition. These laws may impose fines and penalties on building owners or operators who fail to comply with these requirements. In addition, environmental laws and the common law may allow third parties to seek recovery from owners or operators for personal injury associated with exposure to asbestos.

The properties also may contain or develop harmful mold or suffer from other air quality issues. Any of these materials or conditions could result in liability for personal injury and costs of remediating adverse conditions, which could have an adverse effect on our cash flows and ability to make distributions to our stockholders.

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As the owner of real property, we could become subject to liability for a tenant’s failure to comply with environmental requirements regarding the handling and disposal of regulated substances and wastes or for non-compliance with health and safety requirements, which requirements are subject to change.

Some of our tenants may handle regulated substances and wastes as part of their operations at our properties. Environmental laws regulate the handling, use, and disposal of these materials and subject our tenants, and potentially us, to liability resulting from non-compliance with these requirements. The properties in our portfolio also are subject to various federal, state, and local health and safety requirements, such as state and local fire requirements. If we or our tenants fail to comply with these various requirements, we might incur governmental fines or private damage awards. Moreover, we do not know whether or the extent to which existing requirements or their enforcement will change or whether future requirements will require us to make significant unanticipated expenditures that will materially adversely impact our financial condition, results of operations, cash flows, cash available for distribution to stockholders, the market price of our common stock, and our ability to satisfy our debt service obligations. If our tenants become subject to liability for noncompliance, it could affect their ability to make rental payments to us.

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

Although we have reached agreement in principle to settle our two class action lawsuits as further described in“Item 3.—Legal Proceedings”, there is still a risk that the settlement could be rejected by the class or the court and litigation could continue. Such action could result in additional expenses which, if uninsured, could adversely impact our earnings and cash flows, thereby impacting our ability to service debt and make quarterly distributions to our stockholders. In addition, we have not yet determined how much of the $7.5 million settlement payments which have been agreed to will be recovered from our insurers. Therefore, there can be no assurance that our insurance policies will fully cover the settlement payments and related legal costs associated with these negotiations. Further, the ultimate resolution of this litigation could impact the availability or cost of some of our insurance coverage, which could adversely impact our results of operations and cash flows, expose us to increased risks that would be uninsured, and/or adversely impact our ability to attract officers and directors.

If our disclosure controls or internal control over financial reporting is not effective, investors could lose confidence in our reported financial information, which could adversely affect the perception of our business and the trading price of our common stock.

The design and effectiveness of our disclosure controls and procedures and internal control over financial reporting may not prevent all errors, misstatements, or misrepresentations. Although management will continue to review the effectiveness of our disclosure controls and procedures and internal control over financial reporting, there can be no guarantee that our internal control over financial reporting will be effective in accomplishing all control objectives all of the time. Deficiencies, including any material weakness, in our internal control over financial reporting which may occur in the future could result in misstatements of our results of operations, restatements of our financial statements, a decline in the trading price of our common stock, or otherwise materially adversely affect our business, reputation, results of operations, financial condition, or liquidity.

Compliance or failure to comply with the Americans with Disabilities Act and other similar regulations could result in substantial costs.

Under the Americans with Disabilities Act, places of public accommodation must meet certain federal requirements related to access and use by disabled persons. Noncompliance could result in the imposition of fines by the federal government or the award of damages to private litigants. If we are required to make unanticipated expenditures to comply with the Americans with Disabilities Act, including removing access barriers, then our cash flows and the amounts available for distributions to our stockholders may be adversely affected. Although we believe that our properties are currently in material compliance with these regulatory requirements, we have not conducted an audit or investigation of all of our properties to determine our compliance, and we cannot predict the ultimate cost of compliance with the Americans with Disabilities Act or other legislation. If one or more of our properties is not in compliance with the Americans with Disabilities Act or other legislation, then we would be required to incur additional costs to achieve compliance. If we incur substantial costs to comply with the Americans with Disabilities Act or other legislation, our financial condition, results of operations, the market price of our common stock, cash flows, and our ability to satisfy our debt obligations and to make distributions to our stockholders could be adversely affected.

Our operating results may suffer because of potential development and construction delays and resultant increased costs and risks.

In the future, we may acquire and develop properties, including unimproved real properties, upon which we will construct improvements. We may be subject to uncertainties associated with re-zoning for development, environmental concerns of governmental entities and/or community groups, and our builders’ ability to build in conformity with plans, specifications, budgeted costs and timetables. A builder’s performance may also be affected or delayed by conditions beyond the builder’s control. Delays in completing construction could also give tenants the right to terminate preconstruction leases. We may incur additional risks

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when we make periodic progress payments or other advances to builders before they complete construction. These and other factors can result in increased costs of a project or loss of our investment. In addition, we will be subject to normal lease-up risks relating to newly constructed projects. We also must rely on rental income and expense projections and estimates of the fair market value of property upon completion of construction when agreeing upon a purchase price at the time we acquire the property. If our projections are inaccurate, we may pay too much for a property, and our return on our investment could suffer.

Our real estate development strategies may not be successful.

From time to time we may engage in development activities to the extent attractive development projects become available. If we engage in development activities, we will be subject to risks associated with those activities that could adversely affect our financial condition, results of operations, cash flows and ability to pay distributions on, and the market price of, our common stock, including, but not limited to:

• development projects in which we have invested may be abandoned and the related investment will be impaired;

• we may not be able to obtain, or may experience delays in obtaining, all necessary zoning, land-use, building, occupancy and other governmental permits and authorizations;

• we may not be able to obtain land on which to develop;

• we may not be able to obtain financing for development projects, or obtain financing on favorable terms;

• construction costs of a project may exceed the original estimates or construction may not be concluded on schedule, making the project less profitable than originally estimated or not profitable at all (including the possibility of contract default, the effects of local weather conditions, the possibility of local or national strikes and the possibility of shortages in materials, building supplies or energy and fuel for equipment);

• upon completion of construction, we may not be able to obtain, or obtain on advantageous terms, permanent financing for activities that we financed through construction loans; and

• we may not achieve sufficient occupancy levels and/or obtain sufficient rents to ensure the profitability of a completed project.

Moreover, substantial renovation and development activities, regardless of their ultimate success, typically require a significant amount of management’s time and attention, diverting their attention from our other operations.

We face risks related to the occurrence of cyber incidents, or a deficiency in our cybersecurity, which could negatively impact our business by causing a disruption to our operations, a compromise or corruption of our confidential information, and/or damage to our business relationships, all of which could negatively impact our financial results.

A cyber incident is considered to be any adverse event that threatens the confidentiality, integrity, or availability of our information resources. More specifically, a cyber incident is an intentional attack or an unintentional event that can include gaining unauthorized access to systems to disrupt operations, corrupt data, or steal confidential information. The risk of a security breach or disruption, particularly through cyber attacks or cyber intrusion, including by computer hackers, foreign governments and cyber terrorists, has generally increased as the number, intensity and sophistication of attempted attacks and intrusions from around the world have increased. As our reliance on technology has increased, so have the risks posed to our systems, both internal and those we have outsourced. Risks that could directly result from the occurrence of a cyber incident include operational interruption, damage to our relationship with our tenants, potential errors from misstated financial reports, violations of loan covenants, missed reporting deadlines, and private data exposure, among others. Any or all of the preceding risks could have a material adverse effect on our results of operations, financial condition and cash flows. Although we make efforts to maintain the security and integrity of these types of information technology networks and related systems, and we have implemented various measures to manage the risk of a security breach or disruption, there can be no assurance that our security efforts and measures will be effective or that attempted security breaches or disruptions would not be successful or damaging.

Risks Related to Our Organization and Structure

Our organizational documents contain provisions that may have an anti-takeover effect, which may discourage third parties from conducting a tender offer or seeking other change of control transactions that could involve a premium price for our common stock or otherwise benefit our stockholders.

Our charter and bylaws contain provisions that may have the effect of delaying, deferring, or preventing a change in control of our company (including an extraordinary transaction such as a merger, tender offer, or sale of all or substantially all of our assets) that might provide a premium price for our common stock or otherwise be in the best interest of our stockholders. These provisions include, among other things, restrictions on the ownership and transfer of our stock, advance notice requirements for stockholder nominations for directors and other business proposals, and our board of directors’ power to classify or reclassify unissued shares of common or preferred stock and issue additional shares of common or preferred stock.

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In order to preserve our REIT status, our charter limits the number of shares a person may own, which may discourage a takeover that could result in a premium price for our common stock or otherwise benefit our stockholders.

Our charter, with certain exceptions, authorizes our directors to take such actions as are necessary and desirable to preserve our qualification as a REIT for federal income tax purposes. Unless exempted by our board of directors, no person may actually or constructively own more than 9.8% (by value or number of shares, whichever is more restrictive) of the outstanding shares of our common stock or the outstanding shares of any class or series of our preferred stock, which may inhibit large investors from desiring to purchase our stock. This restriction may have the effect of delaying, deferring, or preventing a change in control, including an extraordinary transaction (such as a merger, tender offer, or sale of all or substantially all of our assets) that might provide a premium price for our common stock or otherwise be in the best interest of our stockholders.

Our board of directors can take many actions without stockholder approval.

Our board of directors has overall authority to oversee our operations and determine our major corporate policies. This authority includes significant flexibility. For example, our board of directors can do the following:

• within the limits provided in our charter, prevent the ownership, transfer, and/or accumulation of stock in order to protect our status as a REIT or for any other reason deemed to be in our best interest and the interest of our stockholders;

• issue additional shares of stock without obtaining stockholder approval, which could dilute the ownership of our then-current stockholders;

• amend our charter to increase or decrease the aggregate number of shares of stock or the number of shares of stock of any class or series that we have authority to issue, without obtaining stockholder approval;

• classify or reclassify any unissued shares of our common or preferred stock and set the preferences, rights and other terms of such classified or reclassified shares, without obtaining stockholder approval;

• employ and compensate affiliates;

• direct our resources toward investments that do not ultimately appreciate over time;

• change creditworthiness standards with respect to our tenants;

• change our investment or borrowing policies;

• determine that it is no longer in our best interest to attempt to qualify, or to continue to qualify, as a REIT; and

• suspend, modify or terminate the dividend reinvestment plan.

Any of these actions could increase our operating expenses, impact our ability to make distributions, or reduce the value of our assets without giving our stockholders the right to vote.

Our charter permits our board of directors to issue stock with terms that may subordinate the rights of our common stockholders, which may discourage a third party from acquiring us in a manner that could result in a premium price for our common stock or otherwise benefit our stockholders.

Our board of directors may, without stockholder approval, issue authorized but unissued shares of our common or preferred stock and amend our charter to increase or decrease the aggregate number of shares of stock or the number of shares of stock of any class or series that we have authority to issue. In addition, our board of directors may, without stockholder approval, classify or reclassify any unissued shares of our common or preferred stock and set the preferences, rights and other terms of such classified or reclassified shares. Thus, our board of directors could authorize the issuance of preferred stock with terms and conditions that could have priority with respect to distributions and amounts payable upon liquidation over the rights of the holders of our common stock. Such preferred stock also could have the effect of delaying, deferring, or preventing a change in control, including an extraordinary transaction (such as a merger, tender offer, or sale of all or substantially all of our assets) that might provide a premium price for our common stock, or otherwise be in the best interest of our stockholders.

Our board of directors could elect for us to be subject to certain Maryland law limitations on changes in control that could have the effect of preventing transactions in the best interest of our stockholders.

Certain provisions of Maryland law may have the effect of inhibiting a third party from making a proposal to acquire us or of impeding a change of control under certain circumstances that otherwise could provide the holders of shares of our common stock with the opportunity to realize a premium over the then-prevailing market price of such shares, including:

• “business combination” provisions that, subject to limitations, prohibit certain business combinations between us and an “interested stockholder” (defined generally as any person who beneficially owns 10% or more of the voting power of our outstanding voting stock or any affiliate or associate of ours who, at any time within the two-year period prior to the date in question, was the beneficial owner of 10% or more of the voting power of our then outstanding stock) or an

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affiliate thereof for five years after the most recent date on which the stockholder becomes an interested stockholder and thereafter impose supermajority voting requirements on these combinations; and

• “control share” provisions that provide that “control shares” of our company (defined as shares which, when aggregated with other shares controlled by the stockholder, except solely by virtue of a revocable proxy, entitle the stockholder to exercise one of three increasing ranges of voting power in electing directors) acquired in a “control share acquisition” (defined as the direct or indirect acquisition of ownership or control of “control shares”) have no voting rights except to the extent approved by our stockholders by the affirmative vote of at least two-thirds of all the votes entitled to be cast on the matter, excluding all interested shares.

Our bylaws contain a provision exempting any acquisition by any person of shares of our stock from the control share acquisition statute, and our board of directors has adopted a resolution exempting any business combination with any person from the business combination statute. As a result, these provisions currently will not apply to a business combination or control share acquisition involving our company. However, our board of directors may opt into the business combination provisions and the control share provisions of Maryland law in the future.

Additionally, Maryland law permits our board of directors, without stockholder approval and regardless of what is currently provided in our charter or our bylaws, to implement takeover defenses, some of which (for example, a classified board) we do not currently employ. These provisions may have the effect of inhibiting a third party from making an acquisition proposal for our company or of delaying, deferring, or preventing a change in control of our company under circumstances that otherwise could provide the holders of our common stock with the opportunity to realize a premium over the then-current market price.

Our charter, our bylaws, the limited partnership agreement of our operating partnership, and Maryland law also contain other provisions that may delay, defer, or prevent a transaction or a change of control that might involve a premium price for our common stock or otherwise be in the best interest of our stockholders. In addition, the employment agreements with our named executive officers contain, and grants under our incentive plan also may contain, change-in-control provisions that might similarly have an anti-takeover effect, inhibit a change of our management, or inhibit in certain circumstances tender offers for our common stock or proxy contests to change our board.

Our rights and the rights of our stockholders to recover claims against our directors and officers are limited, which could reduce our recovery and our stockholders’ recovery against them if they negligently cause us to incur losses.

Maryland law provides that a director or officer has no liability in that capacity if he or she performs his or her duties in good faith, in a manner he or she reasonably believes to be in our best interest and with the care that an ordinarily prudent person in a like position would use under similar circumstances. Our charter eliminates our directors’ and officers’ liability to us and our stockholders for money damages except for liability resulting from actual receipt of an improper benefit or profit in money, property, or services or active and deliberate dishonesty established by a final judgment and which is material to the cause of action. Our charter and bylaws require us to indemnify our directors and officers to the maximum extent permitted by Maryland law for any claim or liability to which they may become subject or which they may incur by reason of their service as directors or officers, except to the extent that the act or omission of the director or officer was material to the matter giving rise to the proceeding and was committed in bad faith or was the result of active and deliberate dishonesty, the director or officer actually received an improper personal benefit in money, property, or services, or, in the case of any criminal proceeding, the director or officer had reasonable cause to believe that the act or omission was unlawful. As a result, we and our stockholders may have more limited rights against our directors and officers than might otherwise exist under common law, which could reduce our and our stockholders’ recovery from these persons if they act in a negligent manner. In addition, we may be obligated to fund the defense costs incurred by our directors and officers (as well as by our employees and agents) in some cases.

Risks Related to Our Common Stock

Any change in our dividend policy could have a material adverse effect on the market price of our common stock.

Distributions are authorized and determined by our board of directors in its sole discretion and depend upon a number of factors, including:

• cash available for distribution;

• our results of operations;

• our financial condition, especially in relation to our anticipated future capital needs of our properties;

• the level of reserves we establish for future capital expenditures;

• the distribution requirements for REITs under the Code;

• the level of distributions paid by comparable listed REITs;

• our operating expenses; and

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• other factors our board of directors deems relevant.

We expect to continue to pay quarterly distributions to our stockholders; however, we bear all expenses incurred by our operations, and our funds generated by operations, after deducting these expenses, may not be sufficient to cover desired levels of distributions to our stockholders. Any change in our distribution policy could have a material adverse effect on the market price of our common stock.

There are significant price and volume fluctuations in the public markets, including on the exchange which we listed our common stock.

The U.S. stock markets, including the NYSE on which our common stock is listed, have historically experienced significant price and volume fluctuations. The market price of our common stock may be highly volatile and could be subject to wide fluctuations and investors in our common stock may experience a decrease in the value of their shares, including decreases unrelated to our operating performance or prospects. If the market price of our common stock declines significantly, stockholders may be unable to resell their shares at or above their purchase price. We cannot assure stockholders that the market price of our common stock will not fluctuate or decline significantly in the future. Some of the factors that could negatively affect our stock price or result in fluctuations in the price or trading volume of our common stock include:

• actual or anticipated variations in our quarterly operating results;

• changes in our earnings estimates or publication of research reports about us or the real estate industry, although no assurance can be given that any research reports about us will be published;

• changes in our dividend policy;

• future sales of substantial amounts of our common stock by our existing or future stockholders;

• increases in market interest rates, which may lead purchasers of our stock to demand a higher yield;

• changes in market valuations of similar companies;

• adverse market reaction to any increased indebtedness we incur in the future;

• additions or departures of key personnel;

• actions by institutional stockholders;

• material, adverse litigation judgments;

• speculation in the press or investment community; and

• general market and economic conditions.

Future offerings of debt securities, which would be senior to our common stock upon liquidation, or equity securities, which would dilute our existing stockholders and may be senior to our common stock for the purposes of distributions, may adversely affect the market price of our common stock.

In the future, we may attempt to increase our capital resources by making additional offerings of debt or equity securities, including medium term notes, senior or subordinated notes and classes of preferred or common stock. Upon liquidation, holders of our debt securities and shares of preferred stock and lenders with respect to other borrowings will receive a distribution of our available assets prior to the holders of our common stock. Additional equity offerings may dilute the holdings of our existing stockholders or reduce the market price of our common stock or both. Because our decision to issue securities in any future offering will depend on market conditions and other factors beyond our control, we cannot predict or estimate the amount, timing or nature of our future offerings. Thus, our stockholders bear the risk of our future offerings reducing the market price of our common stock and diluting their proportionate ownership.

Market interest rates may have an effect on the value of our common stock.

One of the factors that investors may consider in deciding whether to buy or sell our common stock is our distribution rate as a percentage of our share price, relative to market interest rates. If market interest rates increase, prospective investors may desire a higher yield on our common stock or seek securities paying higher dividends or yields. It is likely that the public valuation of our common stock will be based primarily on our earnings and cash flows and not from the underlying appraised value of the properties themselves. As a result, interest rate fluctuations and capital market conditions can affect the market value of our common stock. For instance, if interest rates rise, it is likely that the market price of our common stock will decrease, because potential investors may require a higher dividend yield on our common stock as market rates on interest-bearing securities, such as bonds, rise.

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If securities analysts do not publish research or reports about our business or if they downgrade our common stock or our sector, the price of our common stock could decline.

The trading market for our common stock relies in part on the research and reports that industry or financial analysts publish about us or our business. We do not control these analysts. Furthermore, if one or more of the analysts who do cover us downgrades our shares or our industry, or the stock of any of our competitors, the price of our shares could decline. If one or more of these analysts ceases coverage of our company, we could lose attention in the market, which in turn could cause the price of our common stock to decline.

Federal Income Tax Risks

Our failure to qualify as a REIT could adversely affect our operations and our ability to make distributions.

We are owned and operated in a manner intended to qualify us as a REIT for U.S. federal income tax purposes; however, we do not have a ruling from the IRS as to our REIT status. In addition, we own all of the common stock of a subsidiary that has elected to be treated as a REIT, and if our subsidiary REIT were to fail to qualify as a REIT, it is possible that we also would fail to qualify as a REIT unless we (or the subsidiary REIT) could qualify for certain relief provisions. Our qualification and the qualification of our subsidiary REIT as a REIT will depend on satisfaction, on an annual or quarterly basis, of numerous requirements set forth in highly technical and complex provisions of the Code for which there are only limited judicial or administrative interpretations. A determination as to whether such requirements are satisfied involves various factual matters and circumstances not entirely within our control. The fact that we hold substantially all of our assets through our operating partnership and its subsidiaries further complicates the application of the REIT requirements for us. No assurance can be given that we, or our subsidiary REIT, will qualify as a REIT for any particular year.

If we, or our subsidiary REIT, were to fail to qualify as a REIT in any taxable year for which a REIT election has been made, the non-qualifying REIT would not be allowed a deduction for dividends paid to its stockholders in computing our taxable income and would be subject to U.S. federal income tax (including any applicable alternative minimum tax) on its taxable income at corporate rates. Moreover, unless the non-qualifying REIT were to obtain relief under certain statutory provisions, the non-qualifying REIT also would be disqualified from treatment as a REIT for the four taxable years following the year during which qualification is lost. This treatment would reduce our net earnings available for investment or distribution to our stockholders because of the additional tax liability to us for the years involved. As a result of such additional tax liability, we might need to borrow funds or liquidate certain investments on terms that may be disadvantageous to us in order to pay the applicable tax.

Changes in tax laws may eliminate the benefits of REIT status or prevent us from maintaining our qualification as a REIT.

New legislation, regulations, administrative interpretations or court decisions could change the tax laws or interpretations of the tax laws regarding qualification as a REIT, or the federal income tax consequences of that qualification, in a manner that is materially adverse to our stockholders. Accordingly, there is no assurance that we can continue to operate with the current benefits of our REIT status. If there is a change in the tax laws that prevents us from qualifying as a REIT, that eliminates REIT status generally, or that requires REITs generally to pay corporate level income taxes, our results of operations may be adversely affected and we may not be able to make the same level of distributions to our stockholders.

Even if we qualify as a REIT, we may incur certain tax liabilities that would reduce our cash flow and impair our ability to make distributions.

Even if we maintain our status as a REIT, we may be subject to U.S. federal income taxes or state taxes, which would reduce our cash available for distribution to our stockholders. For example, we will be subject to federal income tax on any undistributed taxable income. Further, if we fail to distribute during each calendar year at least the sum of (a) 85% of our ordinary income for such year, (b) 95% of our net capital gain income for such year, and (c) any undistributed taxable income from prior periods, we will be subject to a 4% excise tax on the excess of the required distribution over the sum of (i) the amounts actually distributed by us, plus (ii) retained amounts on which we pay income tax at the corporate level. If we realize net income from foreclosure properties that we hold primarily for sale to customers in the ordinary course of business, we must pay tax thereon at the highest corporate income tax rate, and if we sell a property, other than foreclosure property, that we are determined to have held for sale to customers in the ordinary course of business, any gain realized would be subject to a 100% “prohibited transaction” tax. The determination as to whether or not a particular sale is a prohibited transaction depends on the facts and circumstances related to that sale. We cannot guarantee that sales of our properties would not be prohibited transactions unless we comply with certain safe-harbor provisions. The need to avoid prohibited transactions could cause us to forego or defer sales of properties that might otherwise be in our best interest to sell. In addition, we own interests in certain taxable REIT subsidiaries that are subject to federal income taxation and we and our subsidiaries may be subject to state and local taxes on our income or property.

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Differences between the recognition of taxable income and the actual receipt of cash could require us to sell assets or borrow funds on a short-term or long-term basis to meet the distribution requirements of the Code.

We intend to make distributions to our stockholders to comply with the requirements of the Code for REITs and to minimize or eliminate our corporate tax obligations; however, differences between the recognition of taxable income and the actual receipt of cash could require us to sell assets or borrow funds on a short-term or long-term basis to meet the distribution requirements of the Code. Certain types of assets generate substantial disparity between taxable income and available cash, such as real estate that has been financed through financing structures which require some or all of available cash flows to be used to service borrowings. As a result, the requirement to distribute a substantial portion of our taxable income could cause us to: (1) sell assets in adverse market conditions, (2) borrow on unfavorable terms, or (3) distribute amounts that would otherwise be invested in future acquisitions, capital expenditures, or repayment of debt, in order to comply with REIT requirements. Any such actions could increase our costs and reduce the value of our common stock. Further, we may be required to make distributions to our stockholders when it would be more advantageous to reinvest cash in our business or when we do not have funds readily available for distribution. Compliance with REIT qualification requirements may, therefore, hinder our ability to operate solely on the basis of maximizing profits.

We face possible adverse changes in tax laws including changes to state tax laws regarding the treatment of REITs and their stockholders, which may result in an increase in our tax liability.

From time to time, changes in state and local tax laws or regulations are enacted, including changes to a state’s treatment of REITs and their stockholders, which may result in an increase in our tax liability. The shortfall in tax revenues for states and municipalities in recent years may lead to an increase in the frequency and size of such changes. If such changes occur, we may be required to pay additional taxes on our assets or income. These increased tax costs could adversely affect our financial condition and results of operations and the amount of cash available for payment of dividends.

Distributions made by REITs do not qualify for the reduced tax rates that apply to certain other corporate distributions.

The maximum tax rate for distributions made by corporations to individuals, trusts and estates is generally 15% through 2012 and 20% for dividends paid in 2013. Distributions made by REITs, however, generally are taxed at the normal rate applicable to the individual recipient rather than the 15% preferential rate for 2012 and the 20% preferential rate for dividends paid in 2013. The more favorable rates applicable to regular corporate distributions could cause investors who are individuals to perceive investments in REITs to be relatively less attractive than investments in non-REIT corporations that make distributions.

A recharacterization of transactions undertaken by our operating partnership may result in lost tax benefits or prohibited transactions, which would diminish cash distributions to our stockholders, or even cause us to lose REIT status.

The IRS could recharacterize transactions consummated by our operating partnership, which could result in the income realized on certain transactions being treated as gain realized from the sale of property that is held as inventory or otherwise held primarily for the sale to customers in the ordinary course of business. In such event, the gain would constitute income from a prohibited transaction and would be subject to a 100% tax. If this were to occur, our ability to make cash distributions to our stockholders would be adversely affected. Moreover, our operating partnership may purchase properties and lease them back to the sellers of such properties. While we will use our best efforts to structure any such sale-leaseback transaction such that the lease will be characterized as a “true lease,” thereby allowing us to be treated as the owner of the property for federal income tax purposes, we can give stockholders no assurance that the IRS will not attempt to challenge such characterization. In the event that any such sale-leaseback transaction is challenged and recharacterized as a financing transaction or loan for U.S. federal income tax purposes, deductions for depreciation and cost recovery relating to such property would be disallowed. If a sale-leaseback transaction were so recharacterized, the amount of our adjusted REIT taxable income could be recalculated, which might cause us to fail to meet the distribution requirement for a taxable year. We also might fail to satisfy the REIT qualification asset tests or income tests and, consequently, lose our REIT status. Even if we maintain our status as a REIT, an increase in our adjusted REIT taxable income could cause us to be subject to additional federal and state income and excise taxes. Any federal or state taxes we pay will reduce our cash available for distribution to our stockholders.

Legislative or regulatory action could adversely affect our stockholders.

In recent years, numerous legislative, judicial and administrative changes have been made to the federal income tax laws applicable to investments in REITs and similar entities. Additional changes to tax laws are likely to continue to occur in the future, and we cannot assure stockholders that any such changes will not adversely affect the taxation of a stockholder. Any such changes could have an adverse effect on an investment in our common stock. Stockholders are urged to consult with their tax advisor with respect to the status of legislative, regulatory, or administrative developments and proposals and their potential effect on an investment in common stock.

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Risks Associated with Debt Financing

We have incurred and are likely to continue to incur mortgage and other indebtedness, which may increase our business risks.

As of December 31, 2012, we had total outstanding indebtedness of approximately $1.4 billion. We are likely to incur additional indebtedness to acquire properties or other real estate-related investments, to fund property improvements, and other capital expenditures or for other corporate purposes, such as to repurchase shares of our common stock through repurchase programs that our board of directors has authorized or to fund future distributions to our stockholders. We intend to finance sizable acquisitions by increasing our ratio of total-debt-to-gross assets ratio to a range of 30% to 40%; however, there can be no assurance that we will be successful in achieving or maintaining this ratio. Significant borrowings by us increase the risks of an investment in us. For example, if there is a shortfall between the cash flow from properties and the cash flow needed to service our indebtedness, then the amount available for distributions to stockholders may be reduced. In addition, incurring mortgage debt increases the risk of loss since defaults on indebtedness secured by a property may result in lenders initiating foreclosure actions. Although no such instances exist as of December 31, 2012, in those cases, we could lose the property securing the loan that is in default. For tax purposes, a foreclosure of any of our properties would be treated as a sale of the property for a purchase price equal to the outstanding balance of the debt secured by the mortgage. If the outstanding balance of the debt secured by the mortgage exceeds our tax basis in the property, we would recognize taxable income on foreclosure, but we would not receive any cash proceeds. We may give full or partial guarantees to lenders of mortgage debt on behalf of the entities that own our properties. When we give a guaranty on behalf of an entity that owns one of our properties, we will be responsible to the lender for satisfaction of the debt if it is not paid by such entity. If any mortgages or other indebtedness contain cross-collateralization or cross-default provisions, a default on a single loan could affect multiple properties. If any of our properties are foreclosed on due to a default, our ability to pay cash distributions to our stockholders will be limited.

High mortgage rates may make it difficult for us to finance or refinance properties, which could reduce the number of properties we can acquire, our net income, and the amount of cash distributions we can make.

If mortgage debt is unavailable at reasonable rates, we may not be able to finance the purchase of properties. If we place mortgage debt on properties, we run the risk of being unable to refinance the properties when the loans become due, or of being unable to refinance on favorable terms. If interest rates are higher when we refinance our properties, our income could be reduced. We may be unable to refinance properties. If any of these events occur, our cash flow could be reduced. This, in turn, could reduce cash available for distribution to our stockholders and may hinder our ability to raise more capital by issuing more stock or by borrowing more money.

Existing loan agreements contain, and future financing arrangements will likely contain, restrictive covenants relating to our operations, which could limit our ability to make distributions to our stockholders.

We are subject to certain restrictions pursuant to the restrictive covenants of our outstanding indebtedness, which may affect our distribution and operating policies and our ability to incur additional debt. Loan documents evidencing our existing indebtedness contain, and loan documents entered into in the future will likely contain, certain operating covenants that limit our ability to further mortgage the property or discontinue insurance coverage. In addition, these agreements contain financial covenants, including certain coverage ratios and limitations on our ability to incur secured and unsecured debt, make dividend payments, sell all or substantially all of our assets, and engage in mergers and consolidations and certain acquisitions. Covenants under our existing indebtedness do, and under any future indebtedness likely will, restrict our ability to pursue certain business initiatives or certain acquisition transactions. In addition, failure to meet any of these covenants, including the financial coverage ratios, could cause an event of default under and/or accelerate some or all of our indebtedness, which would have a material adverse effect on us.

Increases in interest rates would increase the amount of our variable-rate debt payments and could limit our ability to pay dividends to our stockholders.

Increases in interest rates will increase our interest costs associated with any future draws that we may make on our $500 Unsecured Line of Credit, which would reduce our cash flows and our ability to pay dividends to our stockholders. In addition, if we are required to repay existing debt during periods of higher interest rates, we may need to sell one or more of our investments in order to repay the debt, which might not permit realization of the maximum return on such investments.

Changes in interest rates could have adverse affects on our cash flows as a result of our interest rate derivative contracts.

We have entered into various interest rate derivative agreements to effectively fix our exposure to interest rates under certain of our existing and anticipated debt facilities. To the extent interest rates are higher than the fixed rate in the respective contract, we would realize cash savings as compared to other market participants. However, to the extent interest rates are below the fixed rate

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in the respective contract, we would make higher cash payments than other similar market participants, which would have an adverse affect on our cash flows as compared to other market participants.

Additionally, there is counterparty risk associated with entering into interest rate derivative contracts. Should market conditions lead to insolvency or make a merger necessary for one or more of our counterparties, or potential future counterparties, it is possible that the terms of our interest rate derivative contracts will not be honored in their current form with a replacement counterparty. The potential termination or renegotiation of the terms of the interest rate derivative contracts as a result of changing counterparties through insolvency or merger could result in an adverse impact on our results of operations and cash flows.

ITEM 1B.    UNRESOLVED STAFF COMMENTS

There were no unresolved SEC staff comments as of December 31, 2012.

ITEM 2.    PROPERTIES

Overview

As of December 31, 2012, we owned interests in 74 office properties, plus five buildings owned through unconsolidated joint ventures. Of our office properties, 72 properties were wholly-owned and two properties are owned through consolidated joint ventures. Our 74 office properties are located in 17 metropolitan areas and, as of December 31, 2012 and 2011, these properties were 87.5% and 86.5% leased, respectively, with an average lease term remaining of approximately seven and six years as of December 31, 2012 and 2011, respectively. The increase in occupancy in 2012 is primarily due to the absorption of previously vacant space at certain of our properties, particularly those located at the River Corporate Center in Tempe, Arizona, the 1200 Enclave building in Houston, Texas, and Windy Point II building in Schaumburg, Illinois, among others. In addition, it is important to note that some of our recently acquired properties, for example the Medici building located in Atlanta, Georgia and the 400 TownPark building located in Lake Mary, Florida, among others, are considered "value-add" properties; which we define as low-occupancy properties, at the date of purchase, acquired at attractive bases with earnings growth and value appreciation potential achievable through leasing up such assets to a stabilized occupancy. Because these value-add properties, all of which were acquired in 2011, had large vacancies, they negatively affect Piedmont’s overall leased percentage. Removing the impact of these value-add properties, our leased percentage on the stabilized portfolio would have been 90.5% as of December 31, 2012 as compared to 89.1% as of December 31, 2011.

Annualized Lease Revenue (see "Information Regarding Disclosures Presented" above) related to our portfolio of properties was $554.0 million, or $30.89 per leased square foot, as of December 31, 2012 as compared with $557.9 million, or $30.79 per leased square foot, as of December 31, 2011. During the three years ended December 31, 2012, we have been working through a period of intense releasing activity due to the fact that many of our properties were acquired approximately ten years ago with typically seven to ten years of lease term remaining at acquisition. As a result a significant number of leases expired during the last three years while the economy was in recession. In many cases, the expiring space has been renewed or re-leased; however, the new leases may not have commenced or be in some form of abatement. Rental abatements, including operating expense reimbursement abatements, are frequently offered as part of a rental concession package in conjunction with negotiating a lease. Operating expense abatements are recognized in the period that they relate to, whereas rental abatements are recognized on a straight-line basis. In addition to rental and operating expense abatements, market conditions often dictate that we offer allowances for tenant improvements and pay broker commissions, which for large, long-term leases, can be significant. Due to the intense competition for credit-worthy tenants that we have been experiencing over the last several years, in some cases we have had to accept lower market driven rental rates and grant larger tenant improvement packages to renew leases or secure new tenants than a stronger economic climate might have produced. We estimate that the leases we executed for spaces vacant one year or less during the year ended December 31, 2012 will decrease our accrual basis rents by approximately 3.5%.

Property Statistics

The tables below include statistics for our properties that we own directly and through our consolidated joint ventures, but do not include our respective ownership interests in properties that we own through our unconsolidated joint ventures. “Annualized Lease Revenue” is defined in Item 1 of this Annual Report on Form 10-K.

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The following table shows lease expirations of our office portfolio as of December 31, 2012, during each of the next fifteen years and thereafter, assuming no exercise of renewal options or termination rights.

Year of Lease Expiration		Annualized Lease Revenue (in thousands)		Rentable Square Feet Expiring (in thousands)	Percentage of Annualized Lease Revenue (%)
Vacant		$	—	2,562	—
2013	(1)	80,825		1,909	14.6
2014		35,247		979	6.4
2015		35,646		1,431	6.4
2016		30,150		1,038	5.4
2017		39,901		1,157	7.2
2018		45,818		1,606	8.3
2019		52,007		1,961	9.4
2020		26,892		1,046	4.9
2021		14,469		502	2.6
2022		22,453		730	4.1
2023		37,772		1,638	6.8
2024		39,490		1,266	7.1
2025		15,249		636	2.7
2026		3,240		201	0.6
Thereafter		74,836		1,838	13.5
		$	553,995	20,500	100.0

⁽¹⁾  Includes leases with an expiration date of December 31, 2012 aggregating 161,280 square feet and Annualized Lease Revenue of $2,997,576.

The following table shows the geographic diversification of our portfolio as of December 31, 2012.

Location		Annualized Lease Revenue (in thousands)		Rentable Square Feet (in thousands)	Percentage of Annualized Lease Revenue (%)
Chicago		$	128,078	4,780	23.1
Washington, D.C.		121,743		3,056	22.0
New York		80,970		2,658	14.6
Minneapolis		43,631		1,613	7.9
Los Angeles		28,933		999	5.2
Boston		26,056		1,023	4.7
Dallas		24,479		1,276	4.4
Detroit		17,594		930	3.2
Atlanta		16,809		1,051	3.0
Houston		14,448		463	2.6
Philadelphia		14,267		761	2.6
Phoenix		9,095		564	1.7
Central & South Florida		8,304		476	1.5
Nashville		7,275		312	1.3
Other	(1)	12,313		538	2.2
		$	553,995	20,500	100.0

⁽¹⁾  Not more than 1% is attributable to any individual geographic region.

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The following table shows the tenant industry diversification of our portfolio as of December 31, 2012.

Industry		Annualized Lease Revenue (in thousands)		Leased Square Footage (in thousands)	Percentage of Annualized Lease Revenue (%)
Governmental Entity		$	103,413	2,390	18.7
Depository Institutions		50,767		1,773	9.2
Business Services		42,438		1,471	7.7
Petroleum Refining & Related Industries		32,681		776	5.9
Engineering, Accounting, Research, Management & Related Services		31,242		949	5.6
Insurance Carriers		31,075		1,386	5.6
Nondepository Credit Institutions		30,472		1,098	5.5
Communications		18,440		610	3.3
Insurance Agents, Brokers & Services		17,493		719	3.2
Security & Commodity Brokers, Dealers, Exchanges & Services		16,174		602	2.9
Educational Services		15,834		440	2.9
Food & Kindred Products		14,397		398	2.6
Electronic & Other Electrical Equipment & Components, Except Computer		14,119		589	2.5
Transportation Equipment		13,947		518	2.5
Fabricated Metal Products, Except Machinery & Transportation Equipment		12,456		423	2.2
Other	(1)	109,047		3,793	19.7
		$	553,995	17,935	100.0

⁽¹⁾  Not more than 2% is attributable to any individual tenant industry.

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The following table shows the tenant diversification of our portfolio as of December 31, 2012.

Location	Number of Properties	Expiration Date(s) (1)		Annualized Lease Revenues (in thousands) (2)		Percentage of Annualized Lease Revenues (%)
U.S. Government	9	Various	(3)	$	73,553	13.3
BP	1	2013	(4)	32,681		5.9
US Bancorp	3	2024	(5)	27,706		5.0
State of New York	1	2019		19,963		3.6
Independence Blue Cross	1	2023		14,267		2.6
Nestle	1	2015		14,206		2.6
GE	1	2027		13,591		2.5
Shaw	1	2018		9,836		1.8
City of New York	1	2020		9,545		1.7
Lockheed Martin	3	2019	(6)	9,405		1.7
KPMG	2	2027		8,949		1.6
Gallagher	1	2018		8,013		1.4
DDB Needham	1	2018		7,617		1.4
Gemini	1	2021		7,304		1.3
Caterpillar Financial	1	2022		7,275		1.3
Harvard University	2	2017		6,652		1.2
Raytheon	2	2019		6,555		1.2
Catamaran	1	2025		6,530		1.2
KeyBank	2	2016		6,374		1.2
Edelman	1	2024		6,274		1.1
Harcourt	1	2016		6,254		1.1
Qwest Communications	1	2014		5,786		1.0
Jones Lang LaSalle	1	2017		5,777		1.0
First Data Corporation	1	2020		5,691		1.0
Other		Various	(7)	234,191		42.3
				$	553,995	100.0

⁽¹⁾  Represents the expiration year of the majority of the square footage leased by the tenant.

⁽²⁾  Approximately 66% of our ALR is derived from investment grade companies or government agencies.

⁽³⁾  Various expirations ranging from 2013 to 2027.

⁽⁴⁾  Majority of the space is subleased to Aon Corporation. Approximately 89% of the space currently leased by BP Corporation has been re-leased under long-term leases for the period following the BP Corporation lease expiration.

⁽⁵⁾  US Bank's lease at One & Two Meridian Crossings located in Richfield, Minnesota, representing approximately 337,000 square feet and $8.9 million of Annualized Lease Revenue, expires in 2023. Of the space leased at US Bancorp Center in Minneapolis, Minnesota, US Bancorp renewed on 395,000 square feet, representing $10.8 million of Annualized Lease Revenue, through 2024 and Piper Jaffray, a current subtenant, leased 124,000 square feet, representing $3.6 million of Annualized Lease Revenue, through 2025. Approximately 120,000 square feet and $4.3 million of Annualized Lease Revenue will expire in 2014.

⁽⁶⁾  There are three leases with Lockheed Martin. Lockheed Martin's lease at: A) 9221 Corporate Boulevard located in Rockville, Maryland, representing $3.2 million of Annualized Lease Revenue and 115,000 square feet, expires in 2019, B) 9211 Corporate Boulevard, located in Rockville, Maryland, representing $3.2 million of Annualized Lease Revenue and 115,000 square feet, expires in 2014, and C) 400 Virginia Avenue, located in Washington, DC, representing $3.0 million of Annualized Lease Revenue and 52,000 square feet, expires in 2013.

⁽⁷⁾  Not more than 1% is attributable to any individual tenant.

Certain Restrictions Related to our Properties

Control of certain properties is limited to a certain extent because the properties are owned through joint ventures. In addition, certain of our properties are subject to ground leases and certain properties are held as collateral for debt. Refer to Schedule III

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listed in the index of Item 15(a) of this report, which details three properties subject to ground leases and nineteen properties held as collateral for debt facilities as of December 31, 2012.

ITEM 3.    LEGAL PROCEEDINGS

Assertions of Legal Actions and Proposed Settlements

In Re Wells Real Estate Investment Trust, Inc. Securities Litigation, Civil Action No. 1:07-cv-00862-CAP

On March 12, 2007, a stockholder filed a class action and derivative complaint in the United States District Court for the District of Maryland against, among others, Piedmont, Piedmont's previous advisors, and certain officers and directors of Piedmont. Upon motion by the defendants, the case was transferred to the United States District Court for the Northern District of Georgia on April 17, 2007.

As subsequently amended and dismissed in part, the complaint alleges violations of Section 14(a), including Rule 14a-9 thereunder, and Section 20(a) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), based upon allegations that the proxy statement for Piedmont's 2007 internalization transaction (the "Internalization") contains false and misleading statements or omits to state material facts. On February 9, 2011, the plaintiff dismissed its claim for violation of Section 20(a) of the Exchange Act.

As subsequently amended and dismissed in part, the complaint seeks, among other things, (i) certification of the class action; (ii) a judgment declaring the proxy statement false and misleading; (iii) unspecified monetary damages; (iv) to nullify any stockholder approvals obtained during the proxy process; (v) to nullify the Internalization; (vi) cancellation and rescission of any stock issued as consideration in the Internalization, or, in the alternative, rescissory damages; and (vii) the payment of reasonable attorneys' fees and experts' fees. On September 16, 2009, the court granted the plaintiff's motion for class certification.

On December 4, 2009, the parties filed motions for summary judgment. On August 2, 2010, the court entered an order denying the defendants' motion for summary judgment and granting, in part, the plaintiff's motion for partial summary judgment.

On November 17, 2011, the court issued rulings granting several of the plaintiff's pre-trial motions to prohibit the defendants from introducing certain evidence, including evidence of the defendants' reliance on advice from their outside legal and financial advisors, and limiting the defendants' ability to relate their subjective views, considerations, and observations during the trial of the case.

On February 23, 2012, the court granted several of defendants' motions, including a motion for reconsideration regarding a motion plaintiff had filed seeking exclusion of certain evidence impacting damages, and motions seeking exclusion of certain evidence proposed to be submitted by plaintiff.

On March 20, 2012, the court granted the defendants leave to file a motion for summary judgment. On April 5, 2012, the defendants filed a motion for summary judgment. On September 26, 2012, the court granted the defendants' motion for summary judgment and entered judgment in favor of the defendants. Plaintiff appealed to the Eleventh Circuit Court of Appeals on October 12, 2012.

In Re Piedmont Office Realty Trust, Inc. Securities Litigation, Civil Action No. 1:07-cv-02660-CAP

On October 25, 2007, the same stockholder mentioned above filed a second purported class action in the United States District Court for the Northern District of Georgia against Piedmont and its board of directors. The complaint attempts to assert class action claims on behalf of (i) those persons who were entitled to tender their shares pursuant to the tender offer filed with the SEC by Lex-Win Acquisition LLC, a former stockholder, on May 25, 2007, and (ii) all persons who are entitled to vote on the proxy statement filed with the SEC on October 16, 2007.

As subsequently amended and dismissed in part, the complaint alleges, among other things, violations of the federal securities laws, including Sections 14(a) and 14(e) of the Exchange Act and Rules 14a-9 and 14e-2(b) promulgated thereunder based upon allegations regarding (i) the failure to disclose certain information in our amended response to the Lex-Win tender offer and (ii) purported misstatements or omissions in our proxy statement concerning then-existing market conditions, the alternatives to a listing or extension that were explored by the defendants, the results of conversations with potential buyers as to our valuation, and certain details of our share redemption program.

On June 10, 2009, the plaintiffs filed a motion for class certification. The court granted the plaintiffs' motion for class certification on March 10, 2010. Defendants sought and received permission from the Eleventh Circuit Court of Appeals to appeal the class certification order on an interlocutory basis. On April 11, 2011, the Eleventh Circuit Court of Appeals invalidated the district court's order certifying a class and remanded the case to the district court for further proceedings.

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Following remand, plaintiffs filed a third amended complaint pursuant to leave granted on September 27, 2011. On October 21, 2011, the defendants filed a motion to dismiss the third amended complaint. On August 27, 2012, the court granted the defendants' motion to dismiss the third amended complaint and entered judgment in favor of the defendants. On September 26, 2012, the plaintiffs filed a notice of appeal with the Eleventh Circuit Court of Appeals.

Agreements in Principle to Resolve Legal Actions

On October 11, 2012, Piedmont reached agreement in principle to settle both of the above lawsuits. Under the terms of the proposed settlement of the first suit, Plaintiff will dismiss the appeal and release all defendants from liability in exchange for total payment of $4.9 million in cash by Piedmont and its insurer. In the second case, Plaintiffs will dismiss the appeal and release all defendants from liability in exchange for total payment of $2.6 million in cash by Piedmont and its insurer. On December 31, 2012, Plaintiffs filed unopposed motions for preliminary approval of the settlements, which were granted by the Court on January 2, 2013. The settlements are subject to court approval following notice to the classes. The Court has set a hearing for April 18, 2013, to determine whether to grant final approval of the settlements. We believe that plaintiffs' allegations in these suits are without merit, and we will continue to vigorously defend these actions if for any reason the settlements are not approved. While there are uncertainties inherent in any litigation process, our assessment of the merits of the claim notwithstanding, the risk of material financial loss does exist.

Other Legal Matters

Piedmont is from time to time a party to other legal proceedings, which arise in the ordinary course of its business. We do not believe any of these ordinary course legal proceedings are reasonably likely to have a material adverse effect on our results of operations or financial condition.

ITEM 4.    MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5.    MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Information and Holders

Our common stock is listed on the New York Stock Exchange under the symbol “PDM.” As of February 26, 2013, there were 17,880 common stockholders of record of our common stock.

The intra-day, high and low sales prices for Piedmont’s common stock during 2011 and 2012 were as follows:

	2012 Quarters
	First		Second		Third		Fourth
High	$	18.91	$	17.97	$	17.98	$	18.56
Low	$	16.97	$	16.10	$	16.57	$	17.08
	2011 Quarters
	First		Second		Third		Fourth
High	$	20.64	$	21.11	$	21.32	$	17.67
Low	$	18.41	$	18.82	$	15.92	$	14.91

Distributions

We intend to make distributions each taxable year equal to at least 90% of our taxable income and 100% of any taxable capital gains on properties sold during the year. We intend to pay regular quarterly dividend distributions to our stockholders and may choose from the following forms of payment: cash, issuance of stock, or a combination of both. Dividends will be made to those stockholders who are stockholders as of the dividend record dates.

Quarterly dividend distributions paid on all outstanding classes of common stock to our stockholders during the years ended December 31, 2012 and 2011 are presented below, and all such dividend payments were made in cash:

	2012
	First		Second		Third		Fourth		Total		% of Total Distribution
Total cash distributed	$	34,526	$	34,418	$	33,675	$	33,549	$	136,168
Per-share investment income	$	0.1460	$	0.1460	$	0.1460	$	0.1460	$	0.5840	73	%
Per-share return of capital	$	0.0220	$	0.0220	$	0.0220	$	0.0220	$	0.0880	11	%
Per-share capital gains	$	0.0320	$	0.0320	$	0.0320	$	0.0320	$	0.1280	16	%
Total per-share distribution	$	0.2000	$	0.2000	$	0.2000	$	0.2000	$	0.8000	100	%

	2011
	First		Second		Third		Fourth		Total		% of Total Distribution
Total cash distributed	$	54,387	$	54,440	$	54,441	$	54,441	$	217,709
Per-share investment income	$	0.1922	$	0.1922	$	0.1922	$	0.1922	$	0.7688	61	%
Per-share return of capital	$	0.0366	$	0.0366	$	0.0366	$	0.0366	$	0.1464	12	%
Per-share capital gains	$	0.0862	$	0.0862	$	0.0862	$	0.0862	$	0.3448	27	%
Total per-share distribution	$	0.3150	$	0.3150	$	0.3150	$	0.3150	$	1.2600	100	%

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Performance Graph

The following graph compares the cumulative total return of Piedmont’s common stock with the S&P 500 Index, the FTSE NAREIT Equity REITs Index, and the FTSE NAREIT Equity Office Index for the period beginning on February 10, 2010 (Piedmont’s initial listing of its common stock on the NYSE) through December 31, 2012. The graph assumes a $100 investment in each of the indices on February 10, 2010 and the reinvestment of all dividends.

Comparison of Cumulative Total Return of One or More Companies, Peer Groups, Industry Indices, and/or Broad Markets

	For the Period from February 10, 2010 to December 31, 2012
	2/10/2010		12/31/2010		12/31/2011		12/31/2012
Piedmont Office Realty Trust Inc.	$	100.00	$	138.02	$	124.94	$	138.67
S&P 500	$	100.00	$	119.36	$	121.88	$	141.38
FTSE NAREIT Equity REITs	$	100.00	$	134.99	$	146.19	$	172.59
FTSE NAREIT Equity Office	$	100.00	$	124.61	$	123.66	$	141.17

The performance graph above is being furnished as part of this Annual Report solely in accordance with the requirement under Rule 14a-3(b)(9) to furnish Piedmont’s stockholders with such information and, therefore, is not deemed to be filed, or incorporated by reference in any filing, by Piedmont under the Securities Act of 1933 or the Securities Exchange Act of 1934.

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Purchases of Equity Securities By the Issuer and Affiliated Purchasers

During the quarter ended December 31, 2012, Piedmont repurchased shares of its common stock in the open market, in order to reissue such shares under its dividend reinvestment plan (the “DRP”), as well as repurchasing and retiring shares as part of our announced stock repurchase program during the fourth quarter of 2012.

Of the 636,039 shares repurchased during the fourth quarter of 2012, 491,500 shares (at an average price of $17.48 per share) related to repurchase of our common stock pursuant to our announced stock repurchase program, and 144,539 shares (at an average price of $17.67 per share) related to shares purchased and conveyed to participants in the DRP. The aggregate stock repurchases for the quarter ended December 31, 2012 are as follows:

Period	Total Number of Shares Purchased (in 000’s)	Average Price Paid per Share		Total Number of Shares  Purchased as Part of Publicly Announced Program (in 000’s) (1)	Maximum Approximate Dollar Value of Shares Available That May Yet Be Purchased Under the Program (in 000’s) (1)
October 1, 2012 to October 31, 2012	201	$	17.33	201	—
November 1, 2012 to November 30, 2012	117	$	17.30	117	—
December 1, 2012 to December 31, 2012	318	$	17.73	174	$	208,019	(1)
Total	636	$	17.53	492	$	208,019	(1)

⁽¹⁾  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. Therefore, the "Maximum Approximate Dollar Value of Shares Available That May Yet Be Purchased Under the Program" relates only to the stock repurchase program. The stock repurchase program was previously announced in our Quarterly Report on Form 10-Q filed November 3, 2011, and authorizes the repurchase of up to $300 million of shares of our common stock, expiring on November 2, 2013. The stock repurchase program is separate from shares purchased for DRP issuance.

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ITEM 6.    SELECTED FINANCIAL DATA

The following sets forth a summary of our selected financial data as of and for the years ended December 31, 2012, 2011, 2010, 2009, and 2008 (in thousands except for per-share data). Our selected financial data is prepared in accordance with U.S. generally accepted accounting principles (“GAAP”), except as noted below.

	2012			2011			2010			2009			2008
Statement of Income Data(1):
Total revenues	$	536,382		$	533,493		$	523,447		$	533,170		$	552,667
Property operating costs	$	212,932		$	207,199		$	195,368		$	205,788		$	202,922
Depreciation and amortization	$	162,906		$	157,289		$	132,780		$	141,280		$	139,877
Impairment loss on real estate assets	$	—		$	—		$	—		$	35,063		$	—
General and administrative expenses	$	20,766		$	25,074		$	28,129		$	26,649		$	30,398
Other income/(expense)	$	(75,937	)	$	(58,853	)	$	(60,367	)	$	(66,953	)	$	(66,575	)
Income from continuing operations(1)	$	63,841		$	85,078		$	106,803		$	57,437		$	112,895
Income from discontinued operations(1)	$	29,378		$	139,978		$	13,591		$	17,278		$	18,434
Net income attributable to noncontrolling interest	$	(15	)	$	(15	)	$	(15	)	$	(15	)	$	(15	)
Net income attributable to Piedmont	$	93,204		$	225,041		$	120,379		$	74,700		$	131,314
Cash Flows:
Cash flows from operations	$	223,252		$	270,343		$	275,750		$	281,543		$	296,515
Cash flows provided by/(used in) investing activities	$	(65,803	)	$	33,732		$	(80,194	)	$	(68,666	)	$	(191,926	)
Cash flows used in financing activities (including dividends paid)	$	(284,182	)	$	(221,103	)	$	(148,842	)	$	(223,206	)	$	(149,272	)
Dividends paid to stockholders and distributions to noncontrolling interest	$	(136,378	)	$	(220,365	)	$	(216,988	)	$	(198,951	)	$	(279,418	)
Per-Share Data(1):
Per weighted-average common share data:
Income from continuing operations per share—basic	$	0.38		$	0.49		$	0.63		$	0.36		$	0.71
Income from continuing operations per share—diluted	$	0.38		$	0.49		$	0.62		$	0.36		$	0.71
Income from discontinued operations per share—basic and diluted	$	0.17		$	0.81		$	0.08		$	0.11		$	0.11
Net income attributable to Piedmont per share—basic	$	0.55		$	1.30		$	0.70		$	0.47		$	0.82
Net income attributable to Piedmont per share—diluted	$	0.55		$	1.30		$	0.70		$	0.47		$	0.82
Dividends declared	$	0.8000		$	1.2600		$	1.2600		$	1.2600		$	1.7604
Weighted-average shares outstanding—basic (in thousands)	170,312			172,765			170,753			158,419			159,586
Weighted-average shares outstanding—diluted (in thousands)	170,441			172,981			170,967			158,581			159,722
Balance Sheet Data (at period end):
Total assets	$	4,254,875		$	4,447,834		$	4,373,480		$	4,395,345		$	4,557,330
Total stockholders’ equity	$	2,640,495		$	2,773,428		$	2,773,454		$	2,606,882		$	2,702,294
Outstanding debt	$	1,416,525		$	1,472,525		$	1,402,525		$	1,516,525		$	1,523,625
Funds from Operations Data(2):
Net income attributable to Piedmont	$	93,204		$	225,041		$	120,379		$	74,700		$	131,314
Depreciation of real estate assets—wholly-owned properties and unconsolidated partnerships	114,340			110,421			105,107			106,878			100,849
Amortization of lease costs—wholly-owned properties and unconsolidated partnerships	50,410			60,132			45,334			57,708			62,767
Gain on consolidation of VIE	—			(1,532		)	—			—			—
Loss on impairment of real estate assets—wholly-owned properties and unconsolidated partnerships	—			—			9,640			37,633			2,088
(Gain)/loss on sale—wholly-owned properties	(27,577		)	(122,657		)	817			—			—
Gain on sale—unconsolidated partnerships	—			(116		)	(25		)	—			—
Funds From Operations(2)	$	230,377		$	271,289		$	281,252		$	276,919		$	297,018
Acquisition costs	141			1,347			600			—			—
Gain on extinguishment of debt	—			(1,039		)	—			—			—
Litigation settlement expense	7,500			—			—			—			—
Net casualty loss	5,170			—			—			—			—
Core Funds From Operations(2)	$	243,188		$	271,597		$	281,852		$	276,919		$	297,018

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⁽¹⁾  Prior period amounts have been adjusted to conform with the current period presentation, including classifying revenues from sold properties as discontinued operations for all periods presented.

⁽²⁾  Net income calculated in accordance with GAAP is the starting point for calculating Funds from Operations (“FFO”) and Core Funds From Operations (“Core FFO”). See Item 7. — "Management's Discussion and Analysis of Financial Condition and Results of Operations" below for a complete definition of the calculations as presented.

ITEM 7.    MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis should be read in conjunction with the audited consolidated financial statements and notes thereto as of December 31, 2012 and 2011, and for the years ended December 31, 2012, 2011, and 2010 included elsewhere in this Annual Report on Form 10-K. See also “Cautionary Note Regarding Forward-Looking Statements” preceding Part I of this report and “Risk Factors” set forth in Item 1A. of this report.

Overview

We are a fully integrated, self-managed real estate investment trust specializing in the acquisition, ownership, management, development, and disposition of primarily high-quality Class A office buildings located in major U.S. office markets and leased primarily to high-credit-quality tenants. We operate as a real estate investment trust for federal income tax purposes.

Our common stock is listed on the New York Stock Exchange (NYSE:PDM) and based on our December 31, 2012 equity market capitalization of $3.0 billion, Piedmont is the fifth largest office REIT in the United States in comparison to the constituents of the Bloomberg U.S. Office REIT Index.

Our portfolio of commercial office buildings is primarily leased to large, credit-worthy, government and corporate tenants, and the majority of our revenue is derived from our office properties in the ten largest U.S. office markets based on rentable square footage, with the most significant concentration in the premier office markets of Chicago, Washington, D.C., and the New York metropolitan area. As of December 31, 2012, we owned and operated 74 office properties (excluding five buildings owned through unconsolidated joint ventures), which are located in 17 metropolitan areas. These 74 office properties comprise 20.5 million square feet, primarily Class A commercial office space, and were 87.5% and 86.5% leased as of December 31, 2012 and 2011, respectively.

During the three years ended December 31, 2012, we have been reducing the number of markets we operate within by selling non-strategic assets and recycling the proceeds into assets and markets which we believe have the greatest potential to contribute to enterprise value over time. In addition, during that same time frame, we have been working through a period of intense releasing activity due to the fact that many of our properties were acquired approximately ten years ago with typically seven to ten years of lease term remaining. As a result a significant number of leases expired during the last three years. During the years ended December 31, 2012 and 2011, we executed new or renewal leases for 3.4 million and 4.0 million square feet, respectively. On a combined basis, this equates to re-leasing over a third of our total portfolio during the last two years.

Liquidity and Capital Resources

We intend to use cash flows generated from the operation of our wholly-owned properties, distributions from our joint ventures, proceeds from selective property dispositions, and proceeds from our $500 Million Unsecured Line of Credit as our primary sources of immediate liquidity. Depending on the timing and volume of our property acquisition and disposition activities and debt maturities, we may also seek other financing opportunities (such as issuance of additional equity or debt securities or additional borrowings from third-party lenders) afforded to us based on our relatively low leverage and quality asset base as additional sources of capital; however, the availability and attractiveness of terms for these sources of capital is highly dependent on market conditions. As of the time of this filing, we had $155.0 million outstanding under our $500 Million Unsecured Line of Credit. As a result, we had approximately $325.6 million under this facility available for future borrowing (approximately $19.4 million of capacity is reserved as security for outstanding letters of credit required by various third parties).

We estimate that our most consistent use of capital will be to fund capital expenditures for our existing portfolio of properties. These expenditures include two types of specifically identified building improvement projects: (i) general repair and maintenance projects that we as the owner may choose to perform at our discretion at any of our various properties and (ii) tenant improvement allowances and leasing commissions that we have committed to as part of executed leases with our tenants. Due to the high lease rollover that we have been experiencing over the last several years, the majority of our recent capital expenditures have related to tenant improvement allowances and leasing commissions. During the years ended December 31, 2012 and 2011, we spent approximately $5.39 and $5.40 per square foot per year of lease term, respectively, for such capital expenditures. As of December 31, 2012, unrecorded contractual obligations for non-incremental tenant improvements related to our existing lease portfolio totaled $111.9 million. The timing of the funding of these commitments is largely dependent upon tenant requests for reimbursement; however, we would anticipate that the majority of this amount would be requested over the next 24-36 months as certain significant

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leases commence. In some instances, these obligations may expire with the respective lease, without further recourse to us. Additionally, commitments for incremental capital expenditures associated with new leases, primarily at value-add properties, total approximately $63.8 million.

We also anticipate granting market-based concession packages, typically consisting of tenant allowances and/or rent abatement periods, and paying broker commissions in conjunction with negotiating future leases. Given that our model is to lease large blocks of space to credit-worthy tenants, as evidenced by our average lease size of between 35,000 and 40,000 square feet, some of the concession packages that we grant can result in significant capital outlays. In particular, over the next eighteen months there are three blocks of space in excess of 200,000 square feet in our Washington, D.C portfolio that will be subject to re-leasing negotiations, and we may grant significant concession packages to secure new, or renew existing, tenants for those buildings. Both the timing and magnitude of these amounts have yet to be determined and are highly dependent on competitive market conditions at the time of lease negotiations.

Subject to the identification and availability of attractive investment opportunities and our ability to consummate additional acquisitions on satisfactory terms, acquiring new assets compatible with our investment strategy could also be a significant use of capital. Further, our board of directors has authorized a repurchase program for our common stock for use when we believe that our stock is trading at a meaningful discount to what we believe the fair value of our assets to be. As of December 31, 2012, there was $208.0 million of authorized capacity remaining on that program which could be spent prior to the program's expiration on November 2, 2013.

On a longer term basis, we expect to use capital to repay debt when obligations become due. We currently have no debt maturing in 2013; however, we have $575 million of secured debt maturing in 2014. Subject to our assessment of market conditions, we currently anticipate refinancing these maturities with unsecured debt prior to their maturity dates in 2014. In anticipation of such an issuance and considering the historically low interest rate environment, we entered into two forward starting interest rate swaps, in November 2012 and January 2013, totaling $140 million to partially protect the Company against rising interest rates and to lock a portion of the interest rate on any future unsecured debt issuance. Again, subject to our assessment of market conditions, we may enter into additional similar swaps during the next twelve months.

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

Results of Operations

Comparison of the accompanying consolidated statements of income for the year ended December 31, 2012 vs. the year ended December 31, 2011

Income from continuing operations per share on a fully diluted basis decreased from $0.49 for the year ended December 31, 2011 to $0.38 for the year ended December 31, 2012 primarily due to the recognition of $7.5 million, or $0.04 per diluted share, in litigation settlement expense and approximately $5.2 million, or $0.03 per diluted share, in net casualty loss in the current year, whereas the prior year's results included approximately $9.1 million, or $0.05 per diluted share, in gains and non-recurring income associated with the foreclosure and consolidation of the 500 W. Monroe building located in Chicago, Illinois and higher lease termination income.

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The following table sets forth selected data from our consolidated statements of income for the years ended December 31, 2012 and 2011, respectively, as well as each balance as a percentage of total revenues for the years presented (dollars in millions):

	December 31, 2012			%		December 31, 2011			%		$ Increase (Decrease)
Revenue:
Rental income	$	425.2				$	412.1				$	13.1
Tenant reimbursements	107.8					115.1					(7.3		)
Property management fee revenue	2.3					1.6					0.7
Other rental income	1.0					4.8					(3.8		)
Total revenues	536.3			100	%	533.6			100	%	2.7
Expense:
Property operating costs	212.9			40	%	207.2			39	%	5.7
Depreciation	112.8			21	%	102.8			19	%	10.0
Amortization	50.1			9	%	54.5			10	%	(4.4		)
General and administrative expense	20.7			4	%	25.1			5	%	(4.4		)
Real estate operating income	139.8			26	%	144.0			27	%	(4.2		)
Other income (expense):
Interest expense	(65.0		)	12	%	(65.8		)	12	%	0.8
Interest and other income	0.8			—	%	2.8			1	%	(2.0		)
Litigation settlement agreement	(7.5		)	1	%	—			—	%	(7.5		)
Net casualty loss	(5.2		)	1	%	—			—	%	(5.2		)
Equity in income of unconsolidated joint ventures	0.9			—	%	1.6			—	%	(0.7		)
Gain on consolidation of variable interest entity	—			—	%	1.5			—	%	(1.5		)
Gain on extinguishment of debt	—			—	%	1.0			—	%	(1.0		)
Income from continuing operations	$	63.8		12	%	$	85.1		16	%	$	(21.3	)
Income from discontinued operations	$	29.4				$	140.0				$	(110.6	)

Revenue

Rental income for the year ended December 31, 2012increased to approximately $425.2 million, as compared to $412.1 million in the prior year. Approximately $9.8 million of the variance is attributable to the recognition of a full year's rental revenue for properties acquired during the year ended December 31, 2011. Additionally, several significant leases commenced in late 2011 or during the year ended December 31, 2012, contributing approximately $5.4 million of the year over year increase. These increases were partially offset by a reduction in leased space due to lease expirations at various properties. In many cases, we have since executed a new lease for the expiring space, but the new lease has not yet commenced. Although we have one significant governmental tenant in our Washington, D.C. portfolio which is expected to vacate its space when its lease expires in March of 2013, we anticipate the decrease in revenue associated with this expiration will be partially offset by the commencement of some of these previously executed leases.

Tenant reimbursements decreased from approximately $115.1 million for the year ended December 31, 2011 to approximately $107.8 million for the year ended December 31, 2012. The decrease is attributable to the expiration of several significant leases during the last several years. In many cases, the expiring space has been re-leased; however, the replacement lease was in some form of abatement during the year ended December 31, 2012. Rental abatements, including operating expense reimbursement abatements, are frequently offered as part of a rental concession package in conjunction with negotiating a lease. Operating expense abatements are recognized in the period that they relate to, rather than on a straight-line basis like rental abatements. In addition, tenant reimbursement income related to properties acquired during the year ended December 31, 2011 contributed approximately $1.2 million to offset the decline in tenant reimbursements related to lease expirations and abatements.

Property management fee revenue increased from approximately $1.6 million for the year ended December 31, 2011 to approximately $2.3 million for the year ended December 31, 2012 primarily as a result of retaining the property management of the 35 West Wacker Drive building in Chicago, Illinois subsequent to selling the building to an unrelated third-party in December 2011.

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Other rental income is comprised primarily of income recognized for lease terminations and restructurings. Unlike the majority of our rental income, which is recognized ratably over long-term contracts, lease termination income is recognized once we have completed our obligation to provide space to the tenant. Such rental income is not comparable between existing or future periods, as it is dependent upon the exercise of lease terminations by particular tenants and/or the execution of restructuring agreements that are deemed by management to be in the best interest of the portfolio over the long term. Generally, the $3.8 million decrease in other rental income for the year ended December 31, 2012 as compared to the year ended December 31, 2011 was due to fewer lease terminations during the current year as compared to the prior year.

Expense

Property operating costs increased approximately $5.7 million for the year ended December 31, 2012 compared to the same period in the prior year. Approximately $5.1 million of increase is due to the recognition of a full year's operating expense related to properties acquired during the year ended December 31, 2011. In addition, we also incurred higher property tax expense of approximately $2.4 million due to the non-recurrence of certain favorable tax appeals recognized in the prior year; however, this increase was significantly offset by a decrease in utility costs of approximately $2.1 million due to a milder winter.

Depreciation expense increased approximately $10.0 million for the year ended December 31, 2012 compared to the same period in the prior year. Approximately $6.5 million of this increase was attributable to depreciation on additional tenant improvements and building expenditures capitalized subsequent to January 1, 2011. The remainder of the increase is due to the recognition of a full year's depreciation expense related to properties acquired during the year ended December 31, 2011.

Amortization expense decreased approximately $4.4 million for the year ended December 31, 2012 compared to the same period in the prior year primarily as a result of lease intangible assets becoming fully amortized at certain of our existing portfolio of properties subsequent to January 1, 2011. This decrease was partially offset by the acceleration of amortization expense on certain lease intangible assets related to a lease termination due to a tenant bankruptcy at our 500 W. Monroe building, which contributed approximately $2.0 million of additional expense compared to the prior year.

General and administrative expenses decreased approximately $4.4 million for the year ended December 31, 2012 compared to the prior year primarily due to lower expense associated with our deferred stock compensation plan in the current period, as well as recoveries in excess of current period billings from our insurance carriers related to our litigation defense.

Other Income (Expense)

Interest expense decreased approximately $0.8 million for the year ended December 31, 2012 as compared to the prior year primarily due to the repayment of $230 million of secured debt between November 2011 and May 2012. However, in November 2011, we entered into a $300 Million Unsecured Term Loan which has an effective interest rate of 2.69% compared to the previous $250 Million Unsecured Term Loan, which carried an effective rate of 2.36% prior to its maturity in June 2011. The decrease in interest expense as a result of the secured debt pay-offs noted above was partially offset by the higher interest rate and principal balance on the unsecured term loan.

Interest and other income decreased approximately $2.0 million for the year ended December 31, 2012 as compared to the prior year. The decrease primarily reflects the recognition in the prior period of previously deferred property operating income upon the successful foreclosure and consolidation of the 500 W. Monroe building.

For the year ended December 31, 2012 we recognized $7.5 million of litigation settlement expense related to potential settlement agreements of the two class action lawsuits which are pending approval. See Notes 2 and 10 of our accompanying consolidated financial statements for further detail.

The approximate $5.2 million net casualty loss we recognized during the year ended December 31, 2012 is due to damage incurred at certain of our assets in the New York/New Jersey markets as a result of Hurricane Sandy which occurred during the fourth quarter of 2012. The damaged properties include the 60 Broad Street building in New York City, New York and the 400 Bridgewater Crossing building in Bridgewater, New Jersey. Such damage resulted in expenses relating to equipment destroyed; costs to clean, repair, and establish emergency operations at the buildings; and rental abatements issued to tenants for business interruption due to their inability to access the space that they lease from us for certain periods of time. These costs totaled approximately $9.2 million and were offset by the recognition of approximately $4.0 million in insurance recoveries. We anticipate further recoveries related to Hurricane Sandy under our insurance programs in future periods.

The approximate $1.5 million gain on the consolidation of VIE recognized during the year ended December 31, 2011 was the net result of recording the estimated fair value of the net assets acquired through our foreclosure of the 500 W. Monroe building.

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The approximate $1.0 million gain on the extinguishment of debt recognized during the year ended December 31, 2011 was the result of our paying off a $45 million mezzanine loan on the 500 W. Monroe building at a discount.

Discontinued Operations

In accordance with GAAP, the operations of the Eastpointe Corporate Center in Issaquah, Washington; the 5000 Corporate Court building in Holtsville, New York; the 35 West Wacker Drive building; the Deschutes building, the Rhein building, the Rogue building, and the Willamette building, as well as 18.19 acres of adjoining, undeveloped land in Beaverton, Oregon (the "Portland Portfolio"); the 26200 Enterprise Way building in Lake Forest, California; and the 110 and 112 Hidden Lake Circle buildings in Duncan, South Carolina are classified as discontinued operations for all periods presented. Income from discontinued operations decreased approximately $110.6 million for the year ended December 31, 2012 compared to the same period in the prior year primarily due to the recognition of the gain on the sale of the 35 West Wacker Drive building in December 2011 as well as a reduction in operating income in the current period from properties sold during the year ended December 31, 2011. We do not expect that income from discontinued operations will be comparable to future periods, as such income is subject to the timing and existence of future property dispositions.

Comparison of the accompanying consolidated statements of income for the year ended December 31, 2011 vs. the year ended December 31, 2010

Income from continuing operations per share on a fully diluted basis decreased from $0.62 for the year ended December 31, 2010 to $0.49 for the year ended December 31, 2011 primarily due to the increase in property operating costs, and increased depreciation and amortization expense associated with properties acquired during 2010 and 2011. Although rental income increased due to properties acquired during the same period, such rental income was negatively impacted by lower rental rates and reductions in leased space at certain of our existing properties. Additionally, we recognized non-recurring, non-cash gains of approximately $1.5 million and $1.0 million related to the consolidation of the VIE containing the 500 W. Monroe building and the early extinguishment of a $45 million mezzanine loan on the building, respectively, during the year ended December 31, 2011.

The following table sets forth selected data from our consolidated statements of income for the years ended December 31, 2011 and 2010, respectively, as well as each balance as a percentage of total revenues for the years presented (dollars in millions):

	December 31, 2011			%		December 31, 2010			%		$ Increase (Decrease)
Revenue:
Rental income	$	412.1				$	401.2				$	10.9
Tenant reimbursements	115.1					114.1					1.0
Property management fee revenue	1.6					3.2					(1.6		)
Other rental income	4.8					5.0					(0.2		)
Total revenues	533.6			100	%	523.5			100	%	10.1
Expense:
Property operating costs	207.2			39	%	195.4			37	%	11.8
Depreciation	102.8			19	%	95.3			18	%	7.5
Amortization	54.5			10	%	37.5			7	%	17.0
General and administrative expense	25.1			5	%	28.1			6	%	(3.0		)
Real estate operating income	144.0			27	%	167.2			32	%	(23.2		)
Other income (expense):
Interest expense	(65.8		)	12	%	(66.5		)	13	%	0.7
Interest and other income	2.8			1	%	3.5			1	%	(0.7		)
Equity in income of unconsolidated joint ventures	1.6			—	%	2.6			—	%	(1.0		)
Gain on consolidation of variable interest entity	1.5			—	%	—			—	%	1.5
Gain on extinguishment of debt	1.0			—	%	—			—	%	1.0
Income from continuing operations	$	85.1		16	%	$	106.8		20	%	$	(21.7	)
Income from discontinued operations	$	140.0				$	13.6				$	126.4

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Revenue

Rental income for the year ended December 31, 2011increased to approximately $412.1 million, as compared to $401.2 million in the prior year. Approximately $24.2 million of the variance is due to properties acquired during 2010 and 2011, as well as increased occupancy at our Piedmont Pointe I and II buildings in Bethesda, Maryland. However, this increase was partially offset by a reduction in leased space due to the increased number of lease expirations and terminations over the past several years. We also experienced lower rates for leases commencing in late 2010 or subsequent to December 31, 2010, primarily related to leases at our 1200 Crown Colony Drive building in Quincy, Massachusetts and our 150 West Jefferson building in Detroit, Michigan, which further offset the aforementioned increases in rental revenues.

Tenant reimbursements increased from approximately $114.1 million for the year ended December 31, 2010 to approximately $115.1 million for the year ended December 31, 2011 primarily due to properties acquired during 2010 and 2011, which accounts for a $10.0 million increase in tenant reimbursements. This variance was largely offset by a decrease in property tax reimbursements due to successful appeals of the assessed values at several of our buildings of approximately $7.0 million as well as a reduction in leased space primarily due to a significant lease expiration at our Windy Point II building.

Other rental income is comprised primarily of income recognized for lease terminations and restructurings. Unlike the majority of our rental income, which is recognized ratably over long-term contracts, lease termination income is recognized once we have completed our obligation to provide space to the tenant. We do not expect other rental income to be comparable in existing or future periods, as it is dependent upon the exercise of lease terminations by particular tenants and/or the execution of restructuring agreements that are deemed by management to be in the best interest of the portfolio over the long term. The most significant component of the approximately $4.8 million in other rental income recognized during the year ended December 31, 2011 related to a lease termination at our 1201 Eye Street building of approximately $2.6 million. Other rental income for the year ended December 31, 2010 relates primarily to a lease termination at our Chandler Forum building in Chandler, Arizona of approximately $3.4 million.

Expense

Property operating costs increased approximately $11.8 million for the year ended December 31, 2011 compared to 2010. This variance is due primarily to properties acquired during 2010 and 2011, which accounts for an approximate $14.9 million increase in property costs. This variance was partially offset by lower estimated property tax expense of approximately $3.4 million as a result of successful appeals of the assessed values at several of our buildings.

Depreciation expense increased approximately $7.5 million for the year ended December 31, 2011 compared to 2010. The variance is primarily attributable to properties acquired during 2010 and 2011, comprising approximately $5.3 million of the increase. Additionally, new tenant improvements and building expenditures capitalized at our existing properties subsequent to January 1, 2010 resulted in additional depreciation expense of approximately $2.0 million.

Amortization expense increased approximately $17.0 million for the year ended December 31, 2011 compared to 2010. The increase is primarily attributable to properties acquired during 2010 and 2011, accounting for approximately $19.2 million of the increase, as well as acceleration of amortization expense on certain lease intangible assets related to various lease terminations at certain of our buildings. The variance is partially offset by lower amortization expense recognized for lease intangible assets that became fully amortized subsequent to January 1, 2010.

General and administrative expenses decreased approximately $3.0 million for the year ended December 31, 2011 compared to 2010. The decrease is primarily attributable to a change in our transfer agent in January 2011 and costs associated with our recapitalization of our common stock, listing of our common stock on the NYSE, and other related investor support expenses in 2010. The decrease was partially offset by higher legal fees related to our defense of ongoing litigation.

Other Income (Expense)

Interest expense decreased approximately $0.7 million for the year ended December 31, 2011 as compared to 2010 due to a decrease in the weighted average interest rate for our outstanding debt in the second half of 2011 after the $250 Million Unsecured Term Loan matured in June and was replaced with borrowings on the $500 Million Unsecured Facility. This decrease was partially offset by additional interest expense related to loans on the 500 W. Monroe building assumed in March 2011.

Interest and other income decreased approximately $0.7 million for the year ended December 31, 2011 as compared to 2010. The variance is attributable to an increase in acquisition costs of approximately $0.7 million, due to greater building acquisition activity in the current period.

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Equity in income of unconsolidated joint ventures decreased approximately $1.0 million for the year ended December 31, 2011 as compared to 2010 as a result of the disposition of two unconsolidated joint venture properties in 2011; the 360 Interlocken building in Broomfield, Colorado, and the 47300 Kato Road building in Fremont, California. We expect equity in income of unconsolidated joint ventures to decrease as our unconsolidated joint ventures approach their stated dissolution periods.

The approximate $1.5 million gain on the consolidation of variable interest entity ("VIE") recognized during the year ended December 31, 2011 was the net result of recording the estimated fair value of the net assets acquired through our foreclosure of the 500 W. Monroe building.

The approximate $1.0 million gain on the extinguishment of debt during 2011 is the result of our paying $43.9 million to the respective lenders in full satisfaction of a $45 million mezzanine loan on the 500 W. Monroe building. Piedmont did not incur a defeasance or yield maintenance penalty but did incur approximately $0.1 million of expense associated with the accelerated amortization of capitalized finance costs related to the loan.

Discontinued Operations

In accordance with GAAP, we have classified the operations of the 111 Sylvan Avenue building in Englewood Cliffs, New Jersey, the Eastpointe Corporate Center, the 5000 Corporate Court building, the 35 West Wacker Drive building, the Portland Portfolio, the 26200 Enterprise Way building, and the 110 and 112 Hidden Lake Circle buildings as discontinued operations for all periods presented. Income from discontinued operations increased approximately $126.4 million for the year ended December 31, 2011 compared to 2010. We realized a combined gain on the sale of our Eastpointe Corporate Center, 5000 Corporate Court building, and the 35 West Wacker Drive building of approximately $122.7 million during 2011. There was no activity in 2011 at the 111 Sylvan Avenue building as the property was sold in December 2010.

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

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

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

We calculate Core FFO as FFO (calculated as set forth above) less acquisition costs and other significant, non-recurring items.

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

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

	2012			Per Share (1)			2011			Per Share(1)			2010			Per Share(1)
Net income attributable to Piedmont	$	93,204		$	0.55		$	225,041		$	1.30		$	120,379		$	0.70
Depreciation of real assets (2)	114,340			0.67			110,421			0.64			105,107			0.62
Amortization of lease-related costs (2)	50,410			0.29			60,132			0.35			45,334			0.27
Gain on consolidation of VIE	—			—			(1,532		)	(0.01		)	—			—
Impairment loss on real estate assets (2)	—			—			—			—			9,640			0.06
(Gain)/loss on sale- wholly-owned properties	(27,577		)	(0.16		)	(122,657		)	(0.71		)	817			—
Gain on sale- unconsolidated partnerships	—			—			(116		)	—			(25		)	—
Funds From Operations	$	230,377		$	1.35		$	271,289		$	1.57		$	281,252		$	1.65
Adjustments:
Acquisition costs	141			—			1,347			0.01			600			—
Gain on extinguishment of debt	—			—			(1,039		)	(0.01		)	—			—
Litigation settlement expense	7,500			0.05			—			—			—			—
Net casualty loss	5,170			0.03			—			—			—			—
Core Funds From Operations	$	243,188		$	1.43		$	271,597		$	1.57		$	281,852		$	1.65
Adjustments:
Deferred financing cost amortization	2,648			0.01			3,195			0.02			2,608			0.01
Amortization of fair market adjustments on notes payable	—			—			1,413			0.01			—			—
Depreciation of non real estate assets	502			—			499			—			707			—
Straight-line effects of lease revenue (2)	(17,153		)	(0.10		)	(9,507		)	(0.06		)	(6,088		)	(0.04		)
Stock-based and other non-cash compensation	2,246			0.01			4,705			0.03			3,681			0.02
Net effect of amortization of below-market in-place lease intangibles (2)	(5,678		)	(0.03		)	(7,065		)	(0.04		)	(5,793		)	(0.03		)
Income from amortization of discount on purchase of mezzanine loans	—			—			(484		)	—			(2,405		)	(0.01		)
Acquisition costs	(141		)	—			(1,347		)	(0.01		)	(600		)	—
Non-incremental capital expenditures (3)	(87,657		)	(0.51		)	(60,401		)	(0.35		)	(45,286		)	(0.26		)
Adjusted Funds From Operations	$	137,955		$	0.81		$	202,605		$	1.17		$	228,676		$	1.34
Weighted-average shares outstanding – diluted	170,441						172,981						170,967

⁽¹⁾  Based on weighted-average shares outstanding—diluted.

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

⁽³⁾  Effective July 1, 2011, Piedmont defines non-incremental capital expenditures as capital expenditures of a recurring nature related to tenant improvements, leasing commissions, and building capital that do not incrementally enhance the underlying assets' income generating capacity. Tenant improvements, leasing commissions, building capital and deferred lease incentives incurred to lease space that was vacant at acquisition, leasing costs for spaces vacant for greater than one year, leasing costs for spaces at newly acquired properties for which in-place leases expire shortly after acquisition, improvements associated with the expansion of a building, and renovations that either change the underlying classification from a Class B to a Class A property or enhance the marketability of a building are excluded from this measure. All prior periods presented have been recalculated in accordance with the new definition for comparability.

Property and Same Store Net Operating Income (Cash Basis)

Property Net Operating Income ("Property NOI") (cash basis) is a non-GAAP measure which we use to assess our operating results. It is calculated as real estate operating income with the add-back of corporate general and administrative expense, depreciation and amortization, and impairment losses and the deduction of income and expense associated with lease terminations and income associated with property management performed by Piedmont for other organizations. We present this measure on a

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cash basis, which eliminates the effects of straight lined rents and fair value lease revenue. The company uses this measure as a proxy for the cash generated by our real estate properties. Same Store Net Operating Income ("Same Store NOI") is another non-GAAP measure very similar to Property NOI, however, Same Store NOI only reflects Property NOI attributable to the properties owned or placed in service during the entire span of the current and prior year reporting periods. Same Store NOI excludes amounts attributable to unconsolidated joint venture assets. We believe Same Store NOI is an important measure because it allows us to compare the cash flows generated by our same real estate properties from one period to another. Other REITs may calculate Same Store NOI differently and our calculation should not be compared to that of other REITs.

The following table sets forth our Same Store NOI (cash basis) with a reconciliation to our net income attributable to common stockholders (GAAP basis) for the years ended December 31, 2012 and 2011, respectively (in thousands):

	December 31, 2012			December 31, 2011
Net income attributable to Piedmont	$	93,204		$	225,041
Net income attributable to noncontrolling interest	15			468
Interest expense	65,023			71,749
(Gain) / loss on extinguishment of debt	—			(1,039		)
Depreciation (1)	114,842			110,920
Amortization (1)	50,410			60,132
Litigation settlement expense	7,500			—
Net casualty (gain)/loss	5,170			—
(Gain) / loss on sale of properties (1)	(27,577		)	(122,773		)
(Gain) / loss on consolidation of VIE	—			(1,532		)
General & administrative expenses(1)	20,939			25,085
Management fee revenue	(2,318		)	(1,584		)
Interest and other income(1)	(853		)	(2,775		)
Lease termination income	(999		)	(5,038		)
Lease termination expense - straight line rent & acquisition intangibles write-offs	1,003			924
Straight line rent adjustment(1)	(18,178		)	(10,143		)
Net effect of amortization of below-market in-place lease intangibles(1)	(5,655		)	(7,354		)
Property NOI (cash basis)	302,526			342,081
Acquisitions(2)	(12,357		)	(11,326		)
Dispositions(3)	(2,491		)	(29,415		)
Unconsolidated joint ventures	(2,499		)	(3,185		)
Same Store NOI	$	285,179		$	298,155
Change period over period in Same Store NOI	(4.4		)%	N/A

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

⁽²⁾  Acquisitions consist of the 1200 Enclave Parkway building in Houston, Texas, purchased on March 30, 2011; the 500 West Monroe building in Chicago, Illinois, acquired on March 31, 2011; The Dupree in Atlanta, Georgia, purchased on April 29, 2011; The Medici in Atlanta, Georgia, purchased on June 7, 2011; the 225 and 235 Presidential Way buildings in Woburn, Massachusetts, purchased on September 13, 2011; the 400 TownPark building in Lake Mary, Florida purchased on November 10, 2011; Gavitello Land in Atlanta, Georgia, purchased on June 28, 2012; and Glenridge Highlands III Land in Atlanta, Georgia purchased on October 15, 2012.

⁽³⁾  Dispositions consist of the Eastpointe Corporate Center building, sold on July 1, 2011; the 5000 Corporate Court building, sold on August 31, 2011; the 35 West Wacker Drive building, sold on December 15, 2011; the Portland Portfolio, sold on March 19, 2012; the 26200 Enterprise Way building, sold on May 31, 2012; and 110 and 112 Hidden Lake Circle buildings, sold on September 21, 2012.

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Due to the period of significant lease rollovers that we have been experiencing over the last several years, Same Store NOI decreased from approximately $298.2 million for the year ended December 31, 2011 to approximately $285.2 million for the year ended December 31, 2012. Although much of the space associated with expiring leases has been re-leased, many of these replacement leases do not commence until future periods after extensive refurbishment of the space has occurred or, even if the lease has commenced, the new lease may be at lower rental rates or have contained some form of rental abatement. Additionally, in some cases replacement tenants have not yet been identified. All of these items negatively impact Same Store NOI on a cash basis; however, as our executed but not commenced leases begin and rental abatement periods expire, we expect there will be greater Same Store NOI growth than might otherwise be expected based on changes in our overall leased percentage alone.

Election as a REIT

We have elected to be taxed as a REIT under the Code and have operated as such beginning with our taxable year ended December 31, 1998. To qualify as a REIT, we must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of our adjusted REIT taxable income, computed without regard to the dividends-paid deduction and by excluding net capital gains attributable to our stockholders, as defined by the Code. As a REIT, we generally will not be subject to federal income tax on income that we distribute to our stockholders. If we fail to qualify as a REIT in any taxable year, we may be subject to federal income taxes on our taxable income for that year and for the four years following the year during which qualification is lost and/or penalties, unless the IRS grants us relief under certain statutory provisions. Such an event could materially adversely affect our net income and net cash available for distribution to our stockholders. However, we believe that we are organized and operate in such a manner as to qualify for treatment as a REIT and intend to continue to operate in the foreseeable future in such a manner that we will remain qualified as a REIT for federal income tax purposes. We have elected to treat Piedmont Office Holdings, Inc. (“POH”), a wholly-owned subsidiary of Piedmont, as a taxable REIT subsidiary. POH performs non-customary services for tenants of buildings that we own, including 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. Furthermore during 2011, POH, through a wholly-owned subsidiary (Piedmont Power, LLC), commenced a project to install solar panels at our 400 Bridgewater Crossing building. In addition, for us to continue to qualify as a REIT, our investments in taxable REIT subsidiaries cannot exceed 25% of the value of our total assets.

Inflation

We are exposed to inflation risk, as income from long-term leases is the primary source of our cash flows from operations. There are provisions in the majority of our tenant leases that are intended to protect us from, and mitigate the risk of, the impact of inflation. These provisions include rent steps, reimbursement billings for operating expense pass-through charges, real estate tax, and insurance reimbursements on a per square-foot basis, or in some cases, annual reimbursement of operating expenses above certain per square-foot allowance. However, due to the long-term nature of the leases, the leases may not readjust their reimbursement rates frequently enough to fully cover inflation.

Application of Critical Accounting Policies

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

Investment in Real Estate Assets

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

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Buildings	40 years
Building improvements	5-25 years
Land improvements	20-25 years
Tenant improvements	Shorter of economic life or lease term
Furniture, fixtures, and equipment	3-5 years
Intangible lease assets	Lease term

Allocation of Purchase Price of Acquired Assets

Upon the acquisition of real properties, we allocate the purchase price of properties to acquired tangible assets, consisting of land and building, and identified intangible assets and liabilities, consisting of the value of above-market and below-market leases and the value of in-place leases, based in each case on their estimated fair values.

The fair values of the tangible assets of an acquired property (which includes land and building) are determined by valuing the property as if it were vacant, and the “as-if-vacant” value is then allocated to land and building based on management’s determination of the fair value of these assets. We determine the as-if-vacant fair value of a property using methods similar to those used by independent appraisers. Factors considered by us in performing these analyses include an estimate of carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases, including leasing commissions and other related costs. In estimating carrying costs, we include real estate taxes, insurance, and other operating expenses during the expected lease-up periods based on current market conditions.

The fair values of above-market and below-market in-place leases are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) our estimate of fair market lease rates for the corresponding in-place leases, measured over a period equal to the remaining terms of the leases, taking into consideration the probability of renewals for any below-market leases. The capitalized above-market and below-market lease values are recorded as intangible lease assets or liabilities and amortized as an adjustment to rental income over the remaining terms of the respective leases.

The fair values of in-place leases include direct costs associated with obtaining a new tenant, opportunity costs associated with lost rentals that are avoided by acquiring an in-place lease, and tenant relationships. Direct costs associated with obtaining a new tenant include commissions, tenant improvements, and other direct costs and are estimated based on our consideration of current market costs to execute a similar lease. These direct costs are included in deferred lease costs in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases. The value of opportunity costs is calculated using the contractual amounts to be paid pursuant to the in-place leases over a market absorption period for a similar lease. Customer relationships are valued based on expected renewal of a lease or the likelihood of obtaining a particular tenant for other locations. These lease intangibles are included in intangible lease assets in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases.

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

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

We continually monitor events and changes in circumstances that could indicate that the carrying amounts of the real estate and related intangible assets, both operating properties and properties under construction, in which we have an ownership interest, either directly or through investments in joint ventures, may not be recoverable. When indicators of potential impairment are present for wholly-owned properties, which indicate that the carrying amounts of real estate and related intangible assets may not be recoverable, we assess the recoverability of these assets by determining whether the carrying value will be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition. In the event that such expected undiscounted future cash flows do not exceed the carrying value, we adjust the real estate and related intangible assets to the fair value and recognize an impairment loss. For our investments in unconsolidated joint ventures, we assess the fair value of our investment, as compared to our carrying amount. If we determine that the carrying value is greater than the fair value at any measurement date, we must also determine if such a difference is temporary in nature. Value fluctuations which are “other than temporary” in nature are then recorded to adjust the carrying value to the fair value amount.

Projections of expected future cash flows require that we estimate future market rental income amounts subsequent to the expiration of current lease agreements, property operating expenses, the number of months it takes to re-lease the property, and the number

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of years the property is held for investment, among other factors. The subjectivity of assumptions used in the future cash flow analysis, including capitalization and discount rates, could result in an incorrect assessment of the property’s fair value and, therefore, could result in the misstatement of the carrying value of our real estate and related intangible assets and our net income attributable to Piedmont.

Goodwill

Goodwill is the excess of cost of an acquired entity over the amounts specifically assigned to assets acquired and liabilities assumed in purchase accounting for business combinations, as well as costs incurred as part of the acquisition. We test the carrying value of our goodwill for impairment on an annual basis, or on an interim basis if an event occurs or circumstances change that would indicate the carrying amount may be impaired. Such interim circumstances may include, but are not limited to, significant adverse changes in legal factors or in the general business climate, adverse action or assessment by a regulator, unanticipated competition, the loss of key personnel, or persistent declines in an entity’s stock price below carrying value of the entity. The test prescribed by authoritative accounting guidance is a two-step test. The first step involves comparing the estimated fair value of the entity to its carrying value, including goodwill. Fair value is determined by adjusting the trading price of the stock for various factors including, but not limited to: (i) liquidity or transferability considerations, (ii) control premiums, and/or (iii) fully distributed premiums, if necessary, multiplied by the common shares outstanding. If such calculated fair value exceeds the carrying value, no further procedures or analysis is permitted or required. However, if the carrying value exceeds the calculated fair value, goodwill is potentially impaired and step two of the analysis would be required. Step two of the test involves calculating the implied fair value of goodwill by deducting the fair value of all tangible and intangible net assets of the entity from the entity’s fair value calculated in step one of the test. If the implied value of the goodwill (the remainder left after deducting the fair values of the entity from its calculated overall fair value in step one of the test) is less than the carrying value of goodwill, an impairment loss would be recognized. We have determined through the testing noted above that there are no issues of impairment related to our goodwill as of December 31, 2012.

Investment in Variable Interest Entities

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

We evaluate each investment to determine whether it represents variable interests in a VIE. Further, we evaluate the sufficiency of the entities’ equity investment at risk to absorb expected losses, and whether as a group, the equity has the characteristics of a controlling financial interest.

Interest Rate Derivatives

We periodically enter into interest rate derivative agreements to hedge our exposure to changing interest rates on variable rate debt instruments. As required by GAAP, we record all derivatives on the balance sheet at fair value. We reassess the effectiveness of our derivatives designated as cash flow hedges on a regular basis to determine if they continue to be highly effective and also to determine if the forecasted transactions remain highly probable. Currently, we do not use derivatives for trading or speculative purposes.

The changes in fair value of interest rate swap agreements designated as effective cash flow hedges are recorded in other comprehensive income (“OCI”), and subsequently reclassified to earnings when the hedged transactions occur. Changes in the fair values of derivatives designated as cash flow hedges that do not qualify for hedge accounting treatment, if any, would be recorded as gain/(loss) on interest rate swap in the consolidated statements of income. The fair value of the interest rate derivative agreement is recorded as interest rate derivative asset or as interest rate derivative liability in the accompanying consolidated balance sheets. Amounts received or paid under interest rate derivative agreements are recorded as interest expense in the consolidated income statements as incurred. All of our interest rate derivative agreements as of December 31, 2012 are designated as cash flow hedges.

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Stock-based Compensation

We have issued stock-based compensation in the form of restricted stock to our employees and directors. For employees, such compensation has been issued pursuant to our Long-term Incentive Compensation ("LTIC") program. The LTIC program is comprised of an annual restricted stock grant component and a multi-year performance share component. Awards granted pursuant to the annual restricted stock component are considered equity awards and expensed straight-line over the vesting period, with issuances recorded as a reduction to additional paid in capital. Awards granted pursuant to the performance share component are considered liability awards and are expensed over the service period, with issuances recorded as a reduction to accrued expense. The compensation expense recognized related to both of these award types is recorded as property operating costs for those employees whose job is related to property operation and as general and administrative expense for all other employees and directors in the accompanying consolidated statements of income.

Related-Party Transactions and Agreements

There were no related-party transactions during the three years ended December 31, 2012.

Off-Balance Sheet Arrangements

We are not dependent on off-balance sheet financing arrangements for liquidity. Our off-balance sheet arrangements are discussed in Note 5 “Unconsolidated Joint Ventures” and Note 10 “Commitments and Contingencies” (specifically related to Operating Lease Obligations) of the accompanying consolidated financial statements. The unconsolidated joint ventures in which we invest are prohibited by their governing documents from incurring debt. For further information regarding our commitments under operating lease obligations, see the notes of our accompanying consolidated financial statements, as well as the Contractual Obligations table below.

Contractual Obligations

Our contractual obligations as of December 31, 2012 are as follows (in thousands):

	Payments Due by Period
Contractual Obligations	Total		Less than 1 year		1-3 years		3-5 years			More than 5 years
Long-term debt(1)	$	1,416,525	$	—	$	680,000	$	736,525	(2)	$	—
Operating lease obligations	77,869		750		1,500		1,500			74,119
Total	$	1,494,394	$	750	$	681,500	$	738,025		$	74,119

⁽¹⁾  Amounts include principal payments only. We made interest payments of $62.6 million, including interest rate swap cash settlements related to various interest rate swap agreements in force, during the year ended December 31, 2012 and expect to pay interest in future periods on outstanding debt obligations based on the rates and terms disclosed herein and in Note 6 of our accompanying consolidated financial statements.

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

ITEM 7A.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISKS

Our future income, cash flows, and fair values of our financial instruments depend in part upon prevailing market interest rates. Market risk is the exposure to loss resulting from changes in interest rates, foreign currency, exchange rates, commodity prices, and equity prices. Our exposure to market risk includes interest rate fluctuations in connection with any borrowings under our $500 Million Unsecured Line of Credit and our $300 Million Unsecured Term Loan. As a result, the primary market risk to which we believe we are exposed is interest rate risk. Many factors, including governmental monetary and tax policies, domestic and international economic and political considerations, and other factors that are beyond our control contribute to interest rate risk. Our interest rate risk management objectives are to limit the impact of interest rate changes on earnings and cash flow primarily through a low-to-moderate level of overall borrowings, as well as managing the variability in rate fluctuations on our outstanding debt. As such, a significant portion of our debt is based on fixed interest rates to hedge against instability in the credit markets, and we have effectively fixed the interest rate on our $300 Million Unsecured Term Loan through interest rate swap agreements, provided that we maintain our corporate credit rating. We do not enter into derivative or interest rate transactions for speculative purposes.

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Our financial instruments consist of both fixed and variable-rate debt. As of December 31, 2012, our consolidated debt consisted of the following (in thousands):

	2013		2014			2015			2016				2017			Thereafter		Total
Maturing debt:
Variable rate repayments	$	—	$	—		$	—		$	129,000			$	—		$	—	$	129,000
Variable rate average interest rate	—		—			—			1.39		%		—			—		1.39		%
Fixed rate repayments	$	—	$	575,000		$	105,000		$	467,525		(2)	$	140,000		$	—	$	1,287,525
Fixed rate average interest rate(1)	—		4.89		%	5.29		%	3.72		%		5.76		%	—		4.59		%

⁽¹⁾  See Note 6 of our accompanying consolidated financial statements for further details on our debt structure.

⁽²⁾  The amount includes the $300 Million Unsecured Term Loan which has a stated variable rate; however, Piedmont entered into an interest rate swap agreement which effectively fixes the rate on this loan to 2.69% through November 22, 2016 (provided that we maintain our corporate credit rating).

As of December 31, 2011, our consolidated debt consisted of the following (in thousands):

	2012			2013			2014			2015			2016				Thereafter			Total
Maturing debt:
Variable rate repayments	$	140,000		$	—		$	—		$	—		$	—			$	—		$	140,000
Variable rate average interest rate	1.29		%	—			—			—			—				—			1.29		%
Fixed rate repayments	$	45,000		$	—		$	575,000		$	105,000		$	467,525		(1)	$	140,000		$	1,332,525
Fixed rate average interest rate	5.20		%	—		%	4.89		%	5.29		%	3.72		%		5.76		%	4.61		%

⁽¹⁾  The amount includes the $300 Million Unsecured Term Loan which has a stated variable rate; however, Piedmont entered into an interest rate swap agreement which effectively fixes the rate on this loan to 2.69% through November 22, 2016 (provided that we maintain our corporate credit rating).

As of December 31, 2012 and 2011, the estimated fair value of the line of credit and notes payable above was approximately $1.5 billion. Our interest rate swap agreements in place at December 31, 2012 and 2011 carried notional amounts totaling $300 million and a fixed interest rate of 2.69%.

The variable rate debt outstanding as of December 31, 2012 is based on LIBOR plus a specified margin or prime as elected by us at certain intervals. An increase in the variable interest rate on the variable-rate facilities constitutes a market risk, as a change in rates would increase or decrease interest incurred and therefore cash flows available for distribution to stockholders. The current stated interest rate spread on the $500 Million Unsecured Line of Credit is LIBOR plus 1.175% (based on our current corporate credit rating).

A change in the interest rate on the fixed portion of our debt portfolio, or on the $300 Million Unsecured Term Loan which is effectively fixed through interest rate swaps, impacts the net financial instrument position but has no impact on interest incurred or cash flows.

As of December 31, 2012, a 1% change in interest rates would not have a material effect on our interest expense as our variable rate debt is limited to our $500 Million Unsecured Line of Credit which has $155.0 million outstanding as of the date of this filing.

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ITEM 8.    FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The financial statements and supplementary data filed as part of this report are set forth on page F-1 of this report.

ITEM 9.    CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

There were no disagreements with our independent registered public accountants during the years ended December 31, 2012 or 2011.

ITEM 9A.    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 our Principal Executive Officer and Principal Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures pursuant to Rule 13a-15(e) under the Securities Exchange Act of 1934 as of the end of the period covered by this report. Based upon that evaluation, the Principal Executive Officer and Principal Financial Officer concluded that our disclosure controls and procedures were effective as of the end of the period covered by this annual report in providing a reasonable level of assurance that information we are required to disclose in reports that we file or submit under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods in SEC rules and forms, including providing a reasonable level of assurance that information required to be disclosed by us in such reports is accumulated and communicated to our management, including our Principal Executive Officer and our Principal Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Report of Management on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as a process designed by, or under the supervision of, the Principal Executive Officer and Principal Financial Officer and effected by our management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP and includes those policies and procedures that:

• pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and disposition of our assets;

• provide reasonable assurance that the transactions are recorded as necessary to permit preparation of financial statements in accordance with GAAP, and that our receipts and expenditures are being made only in accordance with authorizations of management and/or members of the board of directors; and

• provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of our assets that could have a material effect on the financial statements.

Because of the inherent limitations of internal control over financial reporting, including the possibility of human error and the circumvention or overriding of controls, material misstatements may not be prevented or detected on a timely basis. In addition, projections of any evaluation of effectiveness to future periods are subject to the risks that controls may become inadequate because of changes and conditions or that the degree of compliance with policies or procedures may deteriorate. Accordingly, even internal controls determined to be effective can provide only reasonable assurance that the information required to be disclosed in reports filed under the Securities Exchange Act of 1934 is recorded, processed, summarized, and represented within the time periods required.

Our management has assessed the effectiveness of our internal control over financial reporting at December 31, 2012. To make this assessment, we used the criteria for effective internal control over financial reporting described in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on this assessment, our management believes that, as of December 31, 2012, our system of internal control over financial reporting was effective.

Piedmont’s independent registered public accounting firm has issued its report on the effectiveness of Piedmont’s internal control over financial reporting, which appears in this Annual Report.

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Changes in Internal Control Over Financial Reporting

There have been no significant changes in our internal control over financial reporting during the quarter ended December 31, 2012 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

ITEM 9B.    OTHER INFORMATION

None.

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PART III

ITEM 10.    DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Pursuant to Paragraph G(3) of the General Instructions to Form 10-K, the information required by Part III (Items 10, 11, 12, 13, and 14) is being incorporated by reference herein from our definitive proxy statement to be filed with the SEC within 120 days of the end of the fiscal year ended December 31, 2012 in connection with our 2013 Annual Meeting of Stockholders.

We have adopted a Code of Ethics, which is available on Piedmont’s Web site at http://www.piedmontreit.com under the “Corporate Governance” section. Any amendments to, or waivers of, the Code of Ethics will be disclosed on our Web site promptly following the date of such amendment or waiver.

ITEM 11.    EXECUTIVE COMPENSATION

The information required by Item 11 will be set forth in our definitive proxy statement to be filed with the SEC within 120 days of the end of the fiscal year ended December 31, 2012, and is incorporated herein by reference.

ITEM 12.    SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information required by Item 12 will be set forth in our definitive proxy statement to be filed with the SEC within 120 days of the end of the fiscal year ended December 31, 2012, and is incorporated herein by reference.

ITEM 13.    CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS AND DIRECTOR INDEPENDENCE

The information required by Item 13 will be set forth in our definitive proxy statement to be filed with the SEC within 120 days of the end of the fiscal year ended December 31, 2012, and is incorporated herein by reference.

ITEM 14.    PRINCIPAL ACCOUNTING FEES AND SERVICES

The information required by Item 14 will be set forth in our definitive proxy statement to be filed with the SEC within 120 days of the end of the fiscal year ended December 31, 2012, and is incorporated herein by reference.

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PART IV

ITEM 15.    EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a) 1.        The financial statements begin on page F-4 of this Annual Report on Form 10-K, and the list of the financial statements contained herein is set forth on page F-1, which is hereby incorporated by reference.

(a) 2.        Schedule III—Real Estate Assets and Accumulated Depreciation

Information with respect to this item begins on page S-1 of this Annual Report on Form 10-K. Other schedules are omitted because of the absence of conditions under which they are required or because the required information is given in the financial statements or notes thereto.

(b) The Exhibits filed in response to Item 601 of Regulation S-K are listed on the Exhibit Index attached hereto.

(c) See (a) 2 above.

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SIGNATURES

Pursuant to the requirements of Sections 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized this 27^th day of February 2013.

Piedmont Office Realty Trust, Inc.
(Registrant)
By:	/s/ DONALD A. MILLER, CFA
	Donald A. Miller, CFA
	President, Principal Executive Officer, and Director

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacity as and on the date indicated.

Signature	Title	Date
/s/ MICHAEL R. BUCHANAN	Director	February 27, 2013
Michael R. Buchanan
/s/ DONALD S. MOSS	Director	February 27, 2013
Donald S. Moss
/s/ WESLEY E. CANTRELL	Director	February 27, 2013
Wesley E. Cantrell
/s/ WILLIAM H. KEOGLER, JR.	Director	February 27, 2013
William H. Keogler, Jr.
/s/ JEFFREY L. SWOPE	Director	February 27, 2013
Jeffrey L. Swope
/s/ FRANK C. MCDOWELL	Director	February 27, 2013
Frank C. McDowell
/s/ RAYMOND G. MILNES, JR.	Director	February 27, 2013
Raymond G. Milnes, Jr.
/s/ W. WAYNE WOODY	Chairman, and Director	February 27, 2013
W. Wayne Woody
/s/ DONALD A. MILLER, CFA	President and Director	February 27, 2013
Donald A. Miller, CFA	(Principal Executive Officer)
/s/ ROBERT E. BOWERS	Chief Financial Officer and Executive Vice-President	February 27, 2013
Robert E. Bowers	(Principal Financial Officer)
/s/ LAURA P. MOON	Chief Accounting Officer	February 27, 2013
Laura P. Moon	(Principal Accounting Officer)

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EXHIBIT INDEX

TO

2012 FORM 10-K

OF

PIEDMONT OFFICE REALTY TRUST, INC.

Exhibit Number	Description of Document
2.1	Agreement and Plan of Merger dated as of February 2, 2007, by and among Piedmont Office Realty Trust, Inc. (f/k/a Wells Real Estate Investment Trust, Inc.) (the “Company”), WRT Acquisition Company, LLC, WGS Acquisition Company, LLC, Wells Real Estate Funds, Inc., Wells Capital, Inc., Wells Management Company, Inc., Wells Advisory Services I, LLC, Wells Real Estate Advisory Services, Inc. and Wells Government Services, Inc. (incorporated by reference to Exhibit 2.1 to the Company’s Current Report on Form 8-K, filed on February 5, 2007)
3.1	Third Articles of Amendment and Restatement of the Company (incorporated by reference to Exhibit 3.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2009, filed on March 16, 2010)
3.2	Articles of Amendment of the Company effective June 30, 2011 (incorporated by reference to Exhibit 3.2 to the Company's Current Report on Form 8-K filed on July 6, 2011)
3.3	Articles Supplementary of the Company effective June 30, 2011 (incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on July 6, 2011)
3.4	Amended and Restated Bylaws of Piedmont Office Realty Trust, Inc. (incorporated by reference to Exhibit 3.2 to the Company's Current Report on Form 8-K, filed on January 22, 2010)
10.1	Amended and Restated Joint Venture Partnership Agreement of Fund XI-Fund XII-REIT Joint Venture dated June 21, 1999, by and among Wells Real Estate Fund XI, L.P., Wells Real Estate Fund XII, L.P. and the Operating Partnership (incorporated by reference to Exhibit 10.29 to Amendment No. 1 to the Company’s Form S-11 Registration Statement (Commission File No. 333-83933), filed on November 17, 1999)
10.2	Joint Venture Partnership Agreement of Wells Fund XII-REIT Joint Venture Partnership dated April 10, 2000, by and between the Operating Partnership and Wells Real Estate Fund XII, L.P. (incorporated by reference to Exhibit 10.11 to Post-Effective Amendment No. 2 to the Company’s Form S-11 Registration Statement (Commission File No. 333-66657), filed on April 25, 2000)
10.3	Joint Venture Partnership Agreement of Wells Fund XIII-REIT Joint Venture Partnership dated June 27, 2001, by and between the Operating Partnership and Wells Real Estate Investment Fund XIII, L.P. (incorporated by reference to Exhibit 10.85 to Post-Effective Amendment No. 3 to the Company’s Form S-11 Registration Statement (Commission File No. 333-44900), filed on July 23, 2001)
10.4	Amended and Restated Promissory Note dated November 1, 2007, by 1201 Eye Street, N.W. Associates LLC in favor of Metropolitan Life Insurance Company (incorporated by reference to Exhibit 10.9 to the Company’s Form 10-K for the fiscal year ended December 31, 2007 filed on March 26, 2008)
10.5	Amended and Restated Deed of Trust, Security Agreement and Fixture Filing dated November 1, 2007, by 1201 Eye Street, N.W. Associates LLC for the benefit of Metropolitan Life Insurance Company (incorporated by reference to Exhibit 10.10 to the Company’s Form 10-K for the fiscal year ended December 31, 2007 filed on March 26, 2008)
10.6	Amended and Restated Promissory Note dated November 1, 2007, by 1225 Eye Street, N.W. Associates LLC in favor of Metropolitan Life Insurance Company (incorporated by reference to Exhibit 10.11 to the Company’s Form 10-K for the fiscal year ended December 31, 2007 filed on March 26, 2008)
10.7	Amended and Restated Deed of Trust, Security Agreement and Fixture Filing dated October 24, 2002, by 1225 Eye Street, N.W. Associates LLC for the benefit of Metropolitan Life Insurance Company (incorporated by reference to Exhibit 10.12 to the Company’s Form 10-K for the fiscal year ended December 31, 2007 filed on March 26, 2008)
10.8	Limited Liability Company Agreement of 1201 Eye Street, N.W. Associates, LLC dated September 27, 2002 (incorporated by reference to Exhibit 10.119 to Post-Effective Amendment No. 6 to the Company’s Form S-11 Registration Statement (Commission File No. 333-85848), filed on December 17, 2003)
10.9	First Amendment to Limited Liability Company Agreement of 1201 Eye Street, N.W. Associates, LLC (incorporated by reference to Exhibit 10.120 to Post-Effective Amendment No. 6 to Company’s Form S-11 Registration Statement (Commission File No. 333-85848), filed on December 17, 2003)

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10.10	Limited Liability Company Agreement of 1225 Eye Street, N.W. Associates, LLC dated September 27, 2002 (incorporated by reference to Exhibit 10.121 to Post-Effective Amendment No. 6 to the Company’s Form S-11 Registration Statement (Commission File No. 333-85848), filed on December 17, 2003)
10.11	First Amendment to Limited Liability Company Associates of 1225 Eye Street, N.W. Associates, LLC (incorporated by reference to Exhibit 10.122 to Post-Effective Amendment No. 6 to the Company’s Form S-11 Registration Statement (Commission File No. 333-85848), filed on December 17, 2003)
10.12	Promissory Note dated April 20, 2004, by Wells REIT-Chicago Center Owner, LLC in favor of Metropolitan Life Insurance Company (incorporated by reference to Exhibit 10.174 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004, filed on August 6, 2004)
10.13	Mortgage, Security Agreement and Fixture Filing by Wells REIT-Chicago Center Owner, LLC to Metropolitan Life Insurance Company (incorporated by reference to Exhibit 10.175 to the Company’s Form 10-Q for the quarterly period ended June 30, 2004, filed on August 6, 2004)
10.14	Loan Agreement (Multi-State) dated May 21, 2004, between Wells REIT-Austin, TX, L.P., Wells REIT—Multi-State Owner, LLC, Wells REIT-Nashville, TN, LLC and Wells REIT—Bridgewater, NJ, LLC; and Morgan Stanley Mortgage Capital Inc. (incorporated by reference to Exhibit 10.176 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004, filed on August 6, 2004)
10.15	Loan Agreement (D.C. Properties) dated May 21, 2004, between Wells REIT-Independence Square, LLC and Morgan Stanley Mortgage Capital Inc. (incorporated by reference to Exhibit 10.177 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004, filed on August 6, 2004)
10.16	Promissory Note dated May 5, 2005, by Wells REIT-800 Nicollett Avenue Owner, LLC. in favor of Wachovia Bank, N.A. (incorporated by reference to Exhibit 10.70 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2005, filed on August 5, 2005)
10.17	Fixed Rate Note dated May 4, 2005, by 4250 N. Fairfax Owner, LLC in favor of JPMorgan Chase Bank, N.A. (incorporated by reference to Exhibit 10.71 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2005, filed on August 5, 2005)
10.18	Amended and Restated Dividend Reinvestment Plan of the Company adopted February 24, 2011 (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K, filed on February 24, 2011)
10.19*	Employment Agreement dated February 2, 2007, by and between the Company and Donald A. Miller, CFA (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K, filed on February 5, 2007)
10.20*	Amendment Number One to Employment Agreement dated February 2, 2007, by and between the Company and Donald A. Miller, CFA (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, filed on September 14, 2011)
10.21	Escrow Agreement dated April 16, 2007, by and among the Company, Wells Advisory Services I, LLC and SunTrust Bank (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K, filed on April 20, 2007)
10.22	Pledge and Security Agreement dated April 16, 2007, by and between the Company, Wells Advisory Services I, LLC, WRT Acquisition Company, LLC and WGS Acquisition Company, LLC (incorporated by reference to Exhibit 99.2 to the Company’s Current Report on Form 8-K, filed on April 20, 2007)
10.23	Registration Rights Agreement dated April 16, 2007, by and among the Company, Wells Advisory Services I, LLC and Wells Capital, Inc. (incorporated by reference to Exhibit 99.5 to the Company’s Current Report on Form 8-K, filed on April 20, 2007)
10.24*	Piedmont Office Realty Trust, Inc. 2007 Omnibus Incentive Plan (f/k/a the Wells Real Estate Investment Trust, Inc. 2007 Omnibus Incentive Plan) (incorporated by reference to Exhibit 99.7 to the Company’s Current Report on Form 8-K, filed on April 20, 2007)
10.25*	Amendment Number One to the Piedmont Office Realty Trust, Inc. 2007 Omnibus Incentive Plan (f/k/a the Wells Real Estate Investment Trust, Inc. 2007 Omnibus Incentive Plan) (incorporated by reference to Exhibit 10.12 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011, filed on August 9, 2011)
10.26	Amendment to Agreement of Limited Partnership of the Operating Partnership, as Amended and Restated as of January 1, 2000, dated April 16, 2007 (incorporated by reference to Exhibit 99.8 to the Company’s Current Report on Form 8-K, filed on April 20, 2007)

49

10.27*	Employment Agreement dated April 16, 2007, by and between the Company and Robert E. Bowers (incorporated by reference to Exhibit 99.9 to the Company’s Current Report on Form 8-K, filed on April 20, 2007)
10.28*	Employment Agreement dated May 14, 2007, by and between the Company and Carroll A. “Bo” Reddic, IV (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K, filed on May 14, 2007)
10.29*	Employment Agreement dated May 14, 2007, by and between the Company and Raymond L. Owens (incorporated by reference to Exhibit 99.2 to the Company’s Current Report on Form 8-K, filed on May 14, 2007)
10.30*	Employment Agreement dated May 14, 2007, by and between the Company and Laura P. Moon (incorporated by reference to Exhibit 99.3 to the Company’s Current Report on Form 8-K, filed on May 14, 2007)
10.31	Master Property Management, Leasing, and Construction Management Agreement dated April 16, 2007 by and among the Company, the Operating Partnership, and Wells Management Company, Inc. (incorporated by reference to Exhibit 99.10 to the Company’s Current Report on Form 8-K, filed on April 20, 2007)
10.32*	Form of Employee Deferred Stock Award Agreement for 2007 Omnibus Incentive Plan of the Company effective May 18, 2007 (incorporated by reference to Exhibit 10.82 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2007, filed on August 7, 2007)
10.33	Amendment to Second Amended and Restated Agreement of Limited Partnership of the Operating Partnership, as Amended and Restated as of January 1, 2000, dated August 8, 2007 (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K, filed on August 10, 2007)
10.34	Term Loan Agreement, dated as of November 22, 2011, among the Operating Partnership, as Borrower, the Company, as Parent, JP Morgan Securities, LLC, and Suntrust Robinson Humphrey, Inc., as Joint-Lead Arrangers and Book Runners, JPMorgan Chase Bank as Administrative Agent, Suntrust Bank as Syndication Agent, Wells Fargo Bank as Documentation Agent, the other banks signatory thereto as Lenders (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, filed on November 29, 2011)
10.35*	2010 Long-Term Incentive Program Award Agreement (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2011, filed on November 3, 2011)
10.36*	2010 Long-Term Incentive Program (incorporated by reference to Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2011, filed on November 3, 2011)
10.37*	Long-Term Incentive Program Award Agreement (incorporated by reference to Exhibit 10.3 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2011, filed on November 3, 2011)
10.38*	Long-Term Incentive Program (incorporated by reference to Exhibit 10.4 to the Company's Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2011, filed on November 3, 2011)
10.39	Revolving Credit Agreement dated August 21, 2012, by and among Piedmont Operating Partnership, LP, the Company, J.P. Morgan Securities LLC, RBC Capital Markets LLC, JPMorgan Chase Bank, N. A., Royal Bank of Canada, PNC Bank, National Association, SunTrust Bank, and U.S. Bank National Association, and the other financial institutions initially signatory thereto and their assignees (incorporated by reference to Exhibit 10.1 to the Company's current report on Form 8-K filed on August 23, 2012)
10.40	Amendment No. 1 to Term Loan Agreement, dated as of August 21, 2012, among Piedmont Operating Partnership, LP, as Borrower, Piedmont Office Realty Trust, Inc., as Parent, JPMorgan Chase Bank as Administrative Agent, and the other banks party thereto as Lenders (incorporated by reference to Exhibit 10.2 to the Company's current report on Form 8-K filed on August 23, 2012)
10.41*	Offer Letter Dated October 17, 2012 among the Company and Robert K. Wiberg
21.1	List of Subsidiaries of the Company
23.1	Consent of Ernst & Young LLP
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

50

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 **

*    Identifies each management contract or compensatory plan required to be filed.

**    Furnished with this Form 10-K.

51

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

Financial Statements	Page
Report of Independent Registered Public Accounting Firm	F-2
Report of Independent Registered Public Accounting Firm on Internal Control Over Financial Reporting	F-3
Consolidated Balance Sheets as of December 31, 2012 and 2011	F-4
Consolidated Statements of Income for the Years Ended December 31, 2012, 2011, and 2010	F-5
Consolidated Statements of Comprehensive Income for the Years Ended December 31, 2012, 2011, and 2010	F-6
Consolidated Statements of Stockholders’ Equity for the Years Ended December 31, 2012, 2011, and 2010	F-7
Consolidated Statements of Cash Flows for the Years Ended December 31, 2012, 2011, and 2010	F-8
Notes to Consolidated Financial Statements	F-9
Financial Statement Schedule
Schedule III - Real Estate Assets and Accumulated Depreciation	S- 1

F-1

Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders

Piedmont Office Realty Trust, Inc.

We have audited the accompanying consolidated balance sheets of Piedmont Office Realty Trust, Inc. as of December 31, 2012 and 2011, and the related consolidated statements of income, comprehensive income, stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2012. Our audits also included the financial statement schedule listed in the Index at Item 15(a). These financial statements and schedule are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements and schedule based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Piedmont Office Realty Trust, Inc. at December 31, 2012 and 2011, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2012, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedule, when considered in relation to the basic financial statements taken as a whole, presents fairly in all material respects the information set forth therein.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Piedmont Office Realty Trust, Inc.'s internal control over financial reporting as of December 31, 2012, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 27, 2013 expressed an unqualified opinion thereon.

Atlanta, Georgia

February 27, 2013

F-2

Report of Independent Registered Public Accounting Firm

on Internal Control Over Financial Reporting

The Board of Directors and Stockholders

Piedmont Office Realty Trust, Inc.

We have audited Piedmont Office Realty Trust, Inc.'s internal control over financial reporting as of December 31, 2012, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (the COSO criteria). Piedmont Office Realty Trust, Inc.'s management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Report of Management on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the company's internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed 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. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Piedmont Office Realty Trust, Inc. maintained, in all material respects, effective internal control over financial reporting as of December 31, 2012, based onthe COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Piedmont Office Realty Trust, Inc. as of December 31, 2012 and 2011, and the related consolidated statements of income, comprehensive income, stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2012 of Piedmont Office Realty Trust, Inc. and our report dated February 27, 2013 expressed an unqualified opinion thereon.

Atlanta, Georgia

February 27, 2013

F-3

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED BALANCE SHEETS

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

	December 31, 2012			December 31, 2011
Assets:
Real estate assets, at cost:
Land	$	629,536		$	640,196
Buildings and improvements, less accumulated depreciation of $883,957 and $792,342 as of December 31, 2012 and December 31, 2011, respectively	2,908,078			2,967,254
Intangible lease assets, less accumulated amortization of $67,940 and $119,419 as of December 31, 2012 and December 31, 2011, respectively	54,745			79,248
Construction in progress	20,373			17,353
Total real estate assets	3,612,732			3,704,051
Investments in unconsolidated joint ventures	37,226			38,181
Cash and cash equivalents	12,957			139,690
Tenant receivables, net of allowance for doubtful accounts of $346 and $631 as of December 31, 2012 and December 31, 2011, respectively	147,337			129,523
Due from unconsolidated joint ventures	463			788
Restricted cash and escrows	334			9,039
Prepaid expenses and other assets	13,022			9,911
Goodwill	180,097			180,097
Interest rate swap	1,075			—
Deferred financing costs, less accumulated amortization of $10,479 and $9,214 as of December 31, 2012 and December 31, 2011, respectively	6,454			5,977
Deferred lease costs, less accumulated amortization of $112,496 and $120,358 as of December 31, 2012 and December 31, 2011, respectively	243,178			230,577
Total assets	$	4,254,875		$	4,447,834
Liabilities:
Line of credit and notes payable	$	1,416,525		$	1,472,525
Accounts payable, accrued expenses, and accrued capital expenditures	127,263			122,986
Deferred income	21,552			27,321
Intangible lease liabilities, less accumulated amortization of $40,931 and $63,981 as of December 31, 2012 and December 31, 2011, respectively	40,805			49,037
Interest rate swaps	8,235			2,537
Total liabilities	1,614,380			1,674,406
Commitments and Contingencies	—			—
Stockholders’ Equity:
Shares-in-trust, 150,000,000 shares authorized, none outstanding as of December 31, 2012 or December 31, 2011	—			—
Preferred stock, no par value, 100,000,000 shares authorized, none outstanding as of December 31, 2012 or December 31, 2011	—			—
Common stock, $.01 par value; 750,000,000 shares authorized, 167,556,001 shares issued and outstanding as of December 31, 2012; and 172,629,748 shares issued and outstanding at December 31, 2011	1,676			1,726
Additional paid-in capital	3,667,051			3,663,662
Cumulative distributions in excess of earnings	(1,022,681		)	(891,032		)
Other comprehensive loss	(7,160		)	(2,537		)
Piedmont stockholders’ equity	2,638,886			2,771,819
Noncontrolling interest	1,609			1,609
Total stockholders’ equity	2,640,495			2,773,428
Total liabilities and stockholders’ equity	$	4,254,875		$	4,447,834

See accompanying notes.

F-4

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF INCOME

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

	Years Ended December 31,
	2012			2011			2010
Revenues:
Rental income	$	425,232		$	412,093		$	401,163
Tenant reimbursements	107,833			115,082			114,039
Property management fee revenue	2,318			1,584			3,212
Other rental income	999			4,734			5,033
	536,382			533,493			523,447
Expenses:
Property operating costs	212,932			207,199			195,368
Depreciation	112,801			102,804			95,267
Amortization	50,105			54,485			37,513
General and administrative	20,766			25,074			28,129
	396,604			389,562			356,277
Real estate operating income	139,778			143,931			167,170
Other income (expense):
Interest expense	(65,023		)	(65,817		)	(66,486		)
Interest and other income	833			2,774			3,486
Litigation settlement expense	(7,500		)	—			—
Net casualty loss	(5,170		)	—			—
Equity in income of unconsolidated joint ventures	923			1,619			2,633
Gain on consolidation of variable interest entity	—			1,532			—
Gain on extinguishment of debt	—			1,039			—
	(75,937		)	(58,853		)	(60,367		)
Income from continuing operations	63,841			85,078			106,803
Discontinued operations:
Operating income, excluding impairment loss	1,801			17,321			23,995
Impairment loss	—			—			(9,587		)
Gain/(loss) on sale of real estate assets	27,577			122,657			(817		)
Income from discontinued operations	29,378			139,978			13,591
Net income	93,219			225,056			120,394
Less: Net income attributable to noncontrolling interest	(15		)	(15		)	(15		)
Net income attributable to Piedmont	$	93,204		$	225,041		$	120,379
Per share information—basic:
Income from continuing operations	$	0.38		$	0.49		$	0.63
Income from discontinued operations	0.17			0.81			0.08
Income attributable to noncontrolling interest	—			—			—
Net income available to common stockholders	$	0.55		$	1.30		$	0.71
Per share information—diluted:
Income from continuing operations	$	0.38		$	0.49		$	0.62
Income from discontinued operations	0.17			0.81			0.08
Income attributable to noncontrolling interest	—			—			—
Net income available to common stockholders	$	0.55		$	1.30		$	0.70
Weighted-average shares outstanding—basic	170,312,328			172,764,838			170,752,520
Weighted-average shares outstanding—diluted	170,441,223			172,980,947			170,967,324

See accompanying notes.

F-5

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

	Years Ended December 31,
	2012					2011					2010
Net income attributable to Piedmont			$	93,204				$	225,041				$	120,379
Other comprehensive (loss)/income:
Effective portion of loss on derivative instruments that are designated and qualify as cash flow hedges (See Note 8)	(7,656	)				(3,064	)				(1,529	)
Less: reclassification of previously recorded loss included in net income (See Note 8)	3,033					1,218					4,704
Other comprehensive (loss)/income			(4,623		)			(1,846		)			3,175
Comprehensive income attributable to Piedmont			$	88,581				$	223,195				$	123,554

See accompanying notes.

F-6

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(in thousands, except per-share amounts)

	Common Stock					Additional Paid-In Capital			Cumulative Distributions in Excess of Earnings			Redeemable Common Stock			Other Comprehensive Loss			Noncontrolling Interest			Total Stockholders’ Equity
	Shares		Amount
Balance, December 31, 2009	158,917		$	1,589		$	3,477,168		$	(798,561	)	$	(75,164	)	$	(3,866	)	$	5,716		$	2,606,882
Net proceeds from issuance of common stock	13,800		138			184,266			—			—			—			—			184,404
Redemptions of fractional shares of common stock at offering	(200	)	(2		)	(2,900		)	—			—			—			—			(2,902		)
Change in redeemable common stock outstanding	—		—			—			—			75,164			—			—			75,164
Dividends to common stockholders($1.26 per share), distributions to noncontrolling interest, and dividends reinvested	—		—			(33		)	(216,940		)	—			—			(15		)	(216,988		)
Shares issued under the 2007 Omnibus Incentive Plan, net of tax	141		2			2,807			—			—			—			—			2,809
Net income attributable to noncontrolling interest	—		—			—			—			—			—			531			531
Net income attributable to Piedmont	—		—			—			120,379			—			—			—			120,379
Other comprehensive income	—		—			—			—			—			3,175			—			3,175
Balance, December 31, 2010	172,658		1,727			3,661,308			(895,122		)	—			(691		)	6,232			2,773,454
Share repurchases as part of announced program	(199	)	(2		)	—			(3,242		)	—			—			—			(3,244		)
Offering costs associated with issuance of common stock	—		—			(479		)	—			—			—			—			(479		)
Attribution of asset sales proceeds to noncontrolling interest	—		—			—			—			—			—			(2,684		)	(2,684		)
Dividends to common stockholders ($1.26 per share), distributions to noncontrolling interest, and dividends reinvested	—		—			(249		)	(217,709		)	—			—			(2,407		)	(220,365		)
Shares issued under the 2007 Omnibus Incentive Plan, net of tax	171		1			3,082			—			—			—			—			3,083
Net income attributable to noncontrolling interest	—		—			—			—			—			—			468			468
Net income attributable to Piedmont	—		—			—			225,041			—			—			—			225,041
Other comprehensive loss	—		—			—			—			—			(1,846		)	—			(1,846		)
Balance, December 31, 2011	172,630		1,726			3,663,662			(891,032		)	—			(2,537		)	1,609			2,773,428
Share repurchases as part of an announced program	(5,255	)	(52		)	—			(88,685		)	—			—			—			(88,737		)
Dividends to common stockholders ($0.80 per share), distributions to noncontrolling interest, and dividends reinvested	—		—			(195		)	(136,168		)	—			—			(15		)	(136,378		)
Offering costs associated with issuance of common stock	—		—			567			—			—			—			—			567
Shares issued under the 2007 Omnibus Incentive Plan, net of tax	181		2			3,017			—			—			—			—			3,019
Net income attributable to noncontrolling interest	—		—			—			—			—			—			15			15
Net income attributable to Piedmont	—		—			—			93,204			—			—			—			93,204
Other comprehensive loss	—		—			—			—			—			(4,623		)	—			(4,623		)
Balance, December 31, 2012	167,556		$	1,676		$	3,667,051		$	(1,022,681	)	$	—		$	(7,160	)	$	1,609		$	2,640,495

See accompanying notes.

F-7

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Years Ended December 31,
	2012			2011			2010
Cash Flows from Operating Activities:
Net income	$	93,219		$	225,056		$	120,394
Operating distributions received from unconsolidated joint ventures	2,338			2,932			4,463
Adjustments to reconcile net income to net cash provided by operating activities:
Income attributable to noncontrolling interest- discontinued operations	—			453			516
Depreciation	113,649			109,730			104,490
Amortization of deferred financing costs and fair market value adjustments on notes payable	2,648			4,777			2,608
Other amortization	48,840			57,969			43,358
Impairment loss on real estate assets	—			—			7,041
Gain on extinguishment of debt	—			(1,041		)	—
Accretion of discount on notes receivable	—			(482		)	(2,400		)
Stock compensation expense	2,246			4,705			3,681
Reduction of long-lived assets due to casualty event	1,980			—			—
Equity in income of unconsolidated joint ventures	(923		)	(1,609		)	(2,633		)
Gain on consolidation of variable interest entity	—			(1,532		)	—
(Gain)/loss on sale of real estate assets	(27,577		)	(122,657		)	817
Changes in assets and liabilities:
Increase in tenant receivables, net	(21,720		)	(13,295		)	(5,564		)
Decrease/(increase) in restricted cash and escrows	8,705			18,720			(11,818		)
Increase in prepaid expenses and other assets	(2,870		)	(760		)	(1,958		)
Increase in accounts payable and accrued expenses	8,486			3,511			12,058
(Decrease)/increase in deferred income	(5,769		)	(16,134		)	697
Net cash provided by operating activities	223,252			270,343			275,750
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(108,487		)	(215,609		)	(114,147		)
Cash assumed upon consolidation of variable interest entity	—			5,063			—
Net sale proceeds from wholly-owned properties and consolidated joint venture	93,839			291,785			51,637
Net sale proceeds received from unconsolidated joint ventures	—			3,036			189
Investments in unconsolidated joint ventures	(136		)	(151		)	(173		)
Liquidation of noncontrolling interest upon sale of consolidated joint venture	—			(95		)	—
Deferred lease costs paid	(51,019		)	(50,297		)	(17,700		)
Net cash (used in)/provided by investing activities	(65,803		)	33,732			(80,194		)
Cash Flows from Financing Activities:
Deferred financing costs paid	(3,125		)	(3,367		)	(710		)
Proceeds from line of credit and notes payable	409,000			829,000			25,000
Repayments of line of credit and notes payable	(465,000		)	(822,875		)	(139,000		)
Net (costs of)/proceeds from issuance of common stock	(229		)	(252		)	185,774
Repurchases of common stock as part of announced program	(88,450		)	(3,244		)	—
Redemptions of common stock	—			—			(2,918		)
Dividends paid to stockholders and distributions to noncontrolling interest	(136,378		)	(220,365		)	(216,988		)
Net cash used in financing activities	(284,182		)	(221,103		)	(148,842		)
Net (decrease)/increase in cash and cash equivalents	(126,733		)	82,972			46,714
Cash and cash equivalents, beginning of year	139,690			56,718			10,004
Cash and cash equivalents, end of year	$	12,957		$	139,690		$	56,718

See accompanying notes.

F-8

PIEDMONT OFFICE REALTY TRUST, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

DECEMBER 31, 2012, 2011, AND 2010

1.    Organization

Piedmont Office Realty Trust, Inc. (“Piedmont”) (NYSE: PDM) is a Maryland corporation that operates in a manner so as to qualify as a real estate investment trust (“REIT”) for federal income tax purposes and engages in the acquisition and ownership of commercial real estate properties throughout the United States, including properties that are under construction, are newly constructed, or have operating histories. Piedmont was incorporated in 1997 and commenced operations in 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 is the sole general partner of Piedmont OP and possesses full legal control and authority over the operations of Piedmont OP. Piedmont OP owns properties directly, through wholly-owned subsidiaries, and through both consolidated and unconsolidated joint ventures. References to Piedmont herein shall include Piedmont and all of its subsidiaries, including Piedmont OP and its subsidiaries and joint ventures.

As of December 31, 2012, Piedmont owned interests in 74 office properties, plus five office buildings owned through unconsolidated joint ventures. Our 74 office properties are located in 17 metropolitan areas across the United States. These office properties comprise 20.5 million square feet of primarily Class A commercial office space, and were 87.5% leased as of December 31, 2012.

2.    Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

Piedmont’s consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of Piedmont, Piedmont’s wholly-owned subsidiaries, any variable interest entity of which Piedmont or any of its wholly-owned subsidiaries is considered the primary beneficiary, or any entity in which Piedmont or any of its wholly-owned subsidiaries owns a controlling interest. In determining whether Piedmont or Piedmont OP has a controlling interest, the following factors, among others, are considered: equity ownership, voting rights, protective rights of investors, and participatory rights of investors.

Piedmont owns interests in three real properties through its ownership in Piedmont Washington Properties, Inc. Piedmont has evaluated this entity based on the criteria outlined above and concluded that it is not a variable interest entity (“VIE”) and that Piedmont has a controlling interest in Piedmont Washington Properties, Inc. Accordingly, Piedmont’s consolidated financial statements include the accounts of Piedmont Washington Properties, Inc.

In addition, Piedmont owns interests in five properties through its ownership in three unconsolidated joint venture partnerships. Management has evaluated these joint ventures and determined that these entities are not VIEs. Although Piedmont is the majority equity participant in certain of these joint ventures, Piedmont does not have a controlling voting interest in any of them; however, Piedmont does exercise significant influence. As a result, the accounts of these joint ventures are not consolidated; but rather accounted for using the equity method of accounting in Piedmont’s consolidated financial statements.

Please refer to Note 7 for a summary of Piedmont’s interests in and consolidation treatment of its various VIEs as of December 31, 2012.

All inter-company balances and transactions have been eliminated upon consolidation.

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

Use of Estimates

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

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Real Estate Assets

Real estate assets are stated at cost, as adjusted for any impairment, less accumulated depreciation. Amounts capitalized to real estate assets consist of the cost of acquisition or construction, any tenant improvements or major improvements, and betterments that extend the useful life of the related asset. All repairs and maintenance are expensed as incurred. Additionally, Piedmont capitalizes interest while the development of a real estate asset is in progress; however, no such interest was capitalized during the three years ended December 31, 2012.

Piedmont’s real estate assets are depreciated or amortized using the straight-line method over the following useful lives:

Buildings	40 years
Building improvements	5-25 years
Land improvements	20-25 years
Tenant improvements	Shorter of economic life or lease term
Furniture, fixtures, and equipment	3-5 years
Intangible lease assets	Lease term

Piedmont continually monitors events and changes in circumstances that could indicate that the carrying amounts of the real estate and related intangible assets of both operating properties and properties under construction in which Piedmont has an ownership interest, either directly or through investments in joint ventures, may not be recoverable. When indicators of potential impairment are present for wholly-owned properties, management assesses whether the respective carrying values will be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition for assets held for use, or with the estimated fair values, less costs to sell, for assets held for sale. Piedmont generally considers assets to be held for sale at the point at which a sale contract is executed and earnest money has become non-refundable. In the event that the expected undiscounted future cash flows for assets held for use or the estimated fair value, less costs to sell, for assets held for sale do not exceed the respective asset carrying value, management adjusts such assets to the respective estimated fair values and recognizes an impairment loss. Estimated fair values are calculated based on the following information, depending upon availability, in order of preference: (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of undiscounted cash flows, including estimated sales value (which is based on key assumptions such as estimated market rents, lease-up periods, estimated lease terms, and capitalization and discount rates).

For properties owned as part of an investment in unconsolidated joint ventures, Piedmont assesses the fair value of its investment as compared to its carrying amount. If Piedmont determines that the carrying value is greater than the fair value at any measurement date, Piedmont must also determine if such a difference is temporary in nature. Value fluctuations which are “other than temporary” in nature are then recorded to adjust the carrying value to the fair value amount.

Allocation of Purchase Price of Acquired Assets

Upon the acquisition of real properties, Piedmont allocates the purchase price of properties to acquired tangible assets, consisting of land and building, and identified intangible assets and liabilities, consisting of the value of above-market and below-market leases and the value of in-place leases, based in each case on their estimated fair values.

The fair values of the tangible assets of an acquired property (which includes land and building) are determined by valuing the property as if it were vacant, and the “as-if-vacant” value is then allocated to land and building based on management’s determination of the relative fair value of these assets. Management determines the as-if-vacant fair value of a property using methods similar to those used by independent appraisers. Factors considered by management in performing these analyses include an estimate of carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases, including leasing commissions and other related costs. In estimating carrying costs, management includes real estate taxes, insurance, and other operating expenses during the expected lease-up periods based on current market conditions.

The fair values of above-market and below-market in-place leases are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) management’s estimate of market rates for the corresponding in-place leases, measured over a period equal to the remaining terms of the leases, taking into consideration the probability of renewals for any below-market leases. The capitalized above-market and below-market lease values are recorded as intangible lease assets or liabilities and amortized as an adjustment to rental revenues over the remaining terms of the respective leases.

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The fair values of in-place leases include direct costs associated with obtaining a new tenant, opportunity costs associated with lost rentals that are avoided by acquiring an in-place lease, and tenant relationships. Direct costs associated with obtaining a new tenant include commissions, tenant improvements, and other direct costs and are estimated based on management’s consideration of current market costs to execute a similar lease. These direct lease origination costs are included in deferred lease costs in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases. The value of opportunity costs is calculated using the contractual amounts to be paid pursuant to the in-place leases over a market absorption period for a similar lease. These lease intangibles are included in intangible lease assets in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases.

Gross intangible assets and liabilities as of December 31, 2012 and 2011, respectively, are as follows (in thousands):

	December 31, 2012		December 31, 2011
Intangible Lease Assets:
Above-Market In-Place Lease Assets	$	21,468	$	33,707
Absorption Period Costs	$	101,217	$	164,960
Intangible Lease Origination Costs (included in Deferred Lease Costs)	$	116,995	$	146,375
Intangible Lease Liabilities (Below-Market In-Place Leases)	$	81,736	$	113,018

For the years ended December 31, 2012, 2011, and 2010, respectively, Piedmont recognized amortization of intangible lease costs as follows (in thousands):

	2012		2011		2010
Amortization expense related to Intangible Lease Origination Costs and Absorption Period Costs	$	36,151	$	48,013	$	34,660
Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues	$	5,678	$	7,065	$	5,788

Net intangible assets and liabilities as of December 31, 2012 will be amortized as follows (in thousands):

	Intangible Lease Assets						Liabilities
	Above-Market In-place Lease Assets		Absorption Period Costs		Intangible Lease Origination Costs		Below-Market In-place Lease Liabilities
For the year ending December 31:
2013	$	1,772	$	8,292	$	9,606	$	6,192
2014	1,581		6,897		8,180		5,280
2015	1,480		6,545		7,543		4,769
2016	1,418		6,152		7,124		4,718
2017	770		5,502		6,820		4,685
Thereafter	324		14,012		19,863		15,161
	$	7,345	$	47,400	$	59,136	$	40,805
Weighted-Average Amortization Period (in years)	5		8		8		8

Investments in Unconsolidated Joint Ventures

Although Piedmont is the majority equity participant in certain unconsolidated joint ventures, Piedmont does not have a controlling voting interest in any of the unconsolidated joint ventures. Piedmont does, however, exercise significant influence over those joint ventures. Accordingly, Piedmont’s investments in unconsolidated joint ventures are recorded using the equity method of accounting, whereby original investments are recorded at cost and subsequently adjusted for contributions, distributions, and net income/(loss) attributable to such joint ventures. Pursuant to the terms of the unconsolidated joint venture agreements, all income and distributions are allocated to the joint venture partners in accordance with their respective ownership interests. Distributions of net cash from operations are generally distributed to the joint venture partners on a quarterly basis, and are classified as cash inflows from operating activities, as they are presumed to be returns on Piedmont’s investment in the respective joint venture. Proceeds received

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as the result of a sale of an asset from an unconsolidated joint venture are considered a return of Piedmont’s investment in the joint venture and classified as cash inflows from investing activities.

Cash and Cash Equivalents

Piedmont considers all highly-liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash equivalents include cash and short-term investments. Short-term investments are stated at cost, which approximates fair value, and consist of investments in money market accounts.

Tenant Receivables, net

Tenant receivables are comprised of rental and reimbursement billings due from tenants and the cumulative amount of future adjustments necessary to present rental income on a straight-line basis. Tenant receivables are recorded at the original amount earned, less an allowance for any doubtful accounts, which approximates fair value. Management assesses the collectibility of tenant receivables on an ongoing basis and provides for allowances as such balances, or portions thereof, become uncollectible. Piedmont adjusted the allowance for doubtful accounts by recording (recoveries of)/provisions for bad debts of approximately $0, ($0.4) million, and $0.8 million for the years ended December 31, 2012, 2011, and 2010, respectively, which are included in general and administrative expenses in the accompanying consolidated statements of income.

Due from Unconsolidated Joint Ventures

Due from unconsolidated joint ventures represents operating distributions due to Piedmont from its investments in unconsolidated joint ventures which have been declared but not received as of period end.

Restricted Cash and Escrows

Restricted cash and escrows principally relate to the following types of items:

• escrow accounts held by lenders to pay future real estate taxes, insurance, debt service, and tenant improvements;

• net sales proceeds from property sales held by qualified intermediary for potential Section 1031 exchange;

• earnest money paid in connection with future acquisitions; and

• security and utility deposits paid by tenants per the terms of their respective leases.

Restricted cash and escrows are generally reclassified to other asset or liability accounts upon being used to purchase assets, satisfy obligations, or settle tenant obligations.

Prepaid Expenses and Other Assets

Prepaid expenses and other assets are primarily comprised of the following items:

• prepaid property taxes, insurance and operating costs;

• receivables which are unrelated to tenants, for example, insurance proceeds receivable from insurers related to casualty losses; and

• equipment, furniture and fixtures, and tenant improvements for Piedmont’s corporate office space, net of accumulated depreciation.

Prepaid expenses and other assets will be expensed as utilized or reclassified to other asset or equity accounts upon being put into service in future periods. Balances without a future economic benefit are expensed as they are identified.

Goodwill

Goodwill is the excess of cost of an acquired entity over the amounts specifically assigned to assets acquired and liabilities assumed in purchase accounting for business combinations. Piedmont tests the carrying value of its goodwill for impairment on an annual basis, or on an interim basis if an event occurs or circumstances change that would indicate the carrying amount may be impaired. Such interim circumstances may include, but are not limited to, significant adverse changes in legal factors or in the general business climate, adverse action or assessment by a regulator, unanticipated competition, the loss of key personnel, or persistent declines in an entity’s stock price below carrying value of the entity. In accordance with GAAP, Piedmont has the option, should it choose to do so, to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, Piedmont concludes that the estimated fair value is greater than the carrying amount, then performing a further two-step impairment test is unnecessary. However, if Piedmont chooses to forgo the availability of the

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qualitative analysis, the test prescribed by authoritative accounting guidance is a two-step test. The first step involves comparing the estimated fair value of the entity to its carrying value, including goodwill. Fair value is determined by adjusting the trading price of the stock for various factors including, but not limited to: (i) liquidity or transferability considerations, (ii) control premiums, and/or (iii) fully distributed premiums, if necessary, multiplied by the common shares outstanding. If such calculated fair value exceeds the carrying value, no further procedures or analysis is required. However, if the carrying value exceeds the calculated fair value, goodwill is potentially impaired and step two of the analysis would be required. Step two of the test involves calculating the implied fair value of goodwill by deducting the fair value of all tangible and intangible net assets of the entity from the entity’s fair value calculated in step one of the test. If the implied value of the goodwill (the remainder left after deducting the fair values of the entity from its calculated overall fair value in step one of the test) is less than the carrying value of goodwill, an impairment loss would be recognized.

Interest Rate Derivatives

Piedmont periodically enters into interest rate derivative agreements to hedge its exposure to changing interest rates. As required by GAAP, Piedmont records all derivatives on the balance sheet at fair value. Piedmont reassesses the effectiveness of its derivatives designated as cash flow hedges on a regular basis to determine if they continue to be highly effective and also to determine if the forecasted transactions remain highly probable. Currently, Piedmont does not use derivatives for trading or speculative purposes.

The changes in fair value of interest rate swap agreements designated as effective cash flow hedges are recorded in other comprehensive income (“OCI”), and subsequently reclassified to earnings when the hedged transactions occur. Changes in the fair values of derivatives designated as cash flow hedges that do not qualify for hedge accounting treatment, if any, would be recorded as gain/(loss) on interest rate swap in the consolidated statements of income. The fair value of the interest rate derivative agreement is recorded as interest rate derivative asset or as interest rate derivative liability in the accompanying consolidated balance sheets. Amounts received or paid under interest rate derivative agreements are recorded as interest expense in the consolidated income statements as incurred. All of Piedmont's interest rate derivative agreements as of December 31, 2012 are designated as cash flow hedges.

Deferred Financing Costs

Deferred financing costs are comprised of costs incurred in connection with securing financing from third-party lenders and are capitalized and amortized to interest expense on a straight-line basis (which approximates the effective interest rate method) over the terms of the related financing arrangements. Piedmont recognized amortization of deferred financing costs for the years ended December 31, 2012, 2011, and 2010 of approximately $2.6 million, $3.2 million, and $2.6 million, respectively, which is included in interest expense in the accompanying consolidated statements of income.

Deferred Lease Costs

Deferred lease costs are comprised of costs and incentives incurred to acquire operating leases, including intangible lease origination costs and direct payroll costs incurred related to negotiating and executing specific leases, and are capitalized and amortized on a straight-line basis over the terms of the related underlying leases. No such internal leasing costs were capitalized for the years ended December 31, 2012, 2011, or 2010. Amortization of deferred leasing costs is reflected in the accompanying consolidated statements of income as follows.

• Piedmont amortized deferred lease costs of approximately $29.8 million, $30.0 million, and $26.8 million for the years ended December 31, 2012, 2011, and 2010, respectively, of which approximately $1.6 million, $1.3 million, and $0.7 million are related to the amortization of deferred common area maintenance costs which are recorded as property operating costs in the accompanying consolidated statements of income. The remaining amortization of deferred lease costs are recorded as amortization expense.

• Piedmont recognized amortization of lease incentives classified as deferred lease costs of $2.5 million, $3.7 million, and $3.4 million, which was recorded as an adjustment to rental income for the years ended December 31, 2012, 2011, and 2010, respectively.

Upon receiving notification of a tenant’s intention to terminate a lease, unamortized deferred lease costs are adjusted to net realizable value through the consolidated statement of income.

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Line of Credit and Notes Payable

Certain mortgage notes included in line of credit and notes payable in the accompanying consolidated balance sheets were assumed upon the acquisition of real properties. When debt is assumed, Piedmont adjusts the loan to fair value with a corresponding adjustment to building. The fair value adjustment is amortized to interest expense over the term of the loan using the effective interest method. Amortization of such fair value adjustments was approximately $0, $1.4 million, and $0 for the years ended December 31, 2012, 2011, and 2010, respectively.

Deferred income

Deferred income is primarily comprised of the following items:

• prepaid rent from tenants; and

• tenant reimbursements related to operating expense or property tax expenses which may be due to tenants as part of an annual operating expense reconciliation.

Deferred income related to prepaid rents from tenants will be recognized as income in the period it is earned. Amounts related to operating expense reconciliations or property tax expense are relieved when the tenant's reconciliation is completed in accordance with the underlying lease, and payment is issued to the tenant.

Shares-in-trust

To date, Piedmont has not issued any shares-in-trust; however, under Piedmont’s charter, it has authority to issue a total of 150,000,000 shares-in-trust, which would be issued only in the event that there is a purported transfer of, or other change in or affecting the ownership of, Piedmont’s capital stock that would result in a violation of the ownership limits that are included in Piedmont’s charter to protect its REIT status.

Preferred Stock

To date, Piedmont has not issued any shares of preferred stock; however, Piedmont is authorized to issue up to 100,000,000 shares of one or more classes or series of preferred stock. Piedmont’s board of directors may determine the relative rights, preferences, and privileges of any class or series of preferred stock that may be issued, and can be more beneficial than the rights, preferences, and privileges attributable to Piedmont’s common stock.

Common Stock

Under Piedmont’s charter, it has authority to issue a total of 750,000,000 shares of common stock with a par value of $0.01 per share. Each share of common stock is entitled to one vote and participates in distributions equally. The board of directors of Piedmont authorized the repurchase and retirement of up to $300 million of Piedmont's common stock through November 2013. Piedmont may repurchase the shares from time to time, in accordance with applicable securities laws, in the open market or in privately negotiated transactions. Repurchases will depend upon market conditions and other factors, and repurchases may be commenced or suspended from time to time in Piedmont's discretion, without prior notice. As of December 31, 2012, approximately $208.0 million is available for share repurchases through November 2013.

Dividends

As a REIT, Piedmont is required by the Internal Revenue Code of 1986, as amended (the “Code”), to make distributions to stockholders each taxable year equal to at least 90% of its taxable income, computed without regard to the dividends-paid deduction and by excluding net capital gains attributable to stockholders (“REIT taxable income”). Piedmont sponsors a dividend reinvestment plan ("DRP") pursuant to which common stockholders may elect (if their brokerage agreements allow) to reinvest an amount equal to the dividends declared on their common shares into additional shares of Piedmont’s common stock in lieu of receiving cash dividends. Under the DRP, Piedmont has the option to either issue shares purchased in the open market or issue shares directly from Piedmont's authorized but unissued shares, in both cases at a 2% discount for the stockholder. Such election takes place at the settlement of each quarterly dividend in which there are participants in the DRP, and may change from quarter to quarter based on management's judgment of the best use of proceeds for Piedmont.

Noncontrolling Interest

Noncontrolling interest represents the equity interests of consolidated entities that are not owned by Piedmont. Noncontrolling interest is adjusted for contributions, distributions, and earnings (loss) attributable to the noncontrolling interest partners of the

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consolidated joint ventures. All earnings and distributions are allocated to the partners of the consolidated joint ventures in accordance with their respective partnership agreements. Earnings allocated to such noncontrolling interest partners are recorded as income attributable to noncontrolling interest in the accompanying consolidated statements of income.

Revenue Recognition

All leases of real estate assets held by Piedmont are classified as operating leases, and the related base rental income is generally recognized on a straight-line basis over the terms of the respective leases. Tenant reimbursements are recognized as revenue in the period that the related operating cost is incurred. Rents and tenant reimbursements collected in advance are recorded as deferred income in the accompanying consolidated balance sheets. Other rental income, consisting primarily of lease termination fees, is recognized once Piedmont has satisfied all obligations under the related lease or lease termination agreement.

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

Stock-based Compensation

Piedmont has issued stock-based compensation in the form of restricted stock to its employees and directors. For employees, such compensation has been issued pursuant to Piedmont's Long-term Incentive Compensation ("LTIC") program. The LTIC program is comprised of an annual restricted stock grant component and a multi-year performance share component. Awards granted pursuant to the annual restricted stock component are considered equity awards and expensed straight-line over the vesting period, with issuances recorded as a reduction to additional paid in capital. Awards granted pursuant to the performance share component are considered liability awards and are expensed over the service period, with issuances recorded as a reduction to accrued expense. The compensation expense recognized related to both of these award types is recorded as property operating costs for those employees whose job is related to property operation and as general and administrative expense for all other employees and directors in the accompanying consolidated statements of income.

Legal Fees and Related Insurance Recoveries

Piedmont recognizes legal expenses in the period in which services are rendered as a component of general and administrative expense or as property operating costs for legal expenses attributable to operating properties. Insurance reimbursements related to ongoing legal matters are recorded as a reduction of legal expense in the period that the insurance company definitively notifies Piedmont of its intent to issue payment.

Litigation Settlement Expense and Related Insurance Recoveries

During the year ended December 31, 2012, Piedmont reached an agreement in principle to settle two separate securities class action lawsuits (See Note 10). As a result of the agreements to settle, Piedmont recorded a $7.5 million charge representing the total of both proposed settlements in its statements of income for the year ended December 31, 2012. Any future insurance recoveries related to these agreements, if applicable, will be recognized as income in the period that the insurance company definitively notifies Piedmont of its intent to issue payment.

Net Casualty Loss/(Gain)

From time to time, certain of our assets may be damaged or destroyed by natural disasters. Such damages may result in significant expenses related to the destruction of fixed assets or costs to clean, repair, and establish emergency operations at the building or buildings affected by the casualty event. In addition, Piedmont may recognize expenses as a result of issuing rent abatements to tenants for business interruptions caused by the tenants' inability to access the space that they lease from Piedmont. Losses related to the above items are estimated and recorded in the period incurred without regard to whether the loss may be ultimately recoverable under Piedmont's various insurance policies. Any insurance recoveries related to such losses, if applicable, are recorded as income in the period receipt is deemed probable. Insurance recoveries in excess of losses recognized or related to business interruption are recorded as income in the period that the insurance company definitively notifies Piedmont of its intent to issue payment. Casualty losses are presented net of insurance recovery income recorded during the period. During the year ended December 31, 2012, substantially all of the net casualty loss recorded related to losses incurred in Piedmont's New York/New Jersey portfolio as a result of Hurricane Sandy which occurred in October 2012.

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Net Income Available to Common Stockholders Per Share

Net income per share-basic is calculated as net income available to common stockholders divided by the weighted average number of common shares outstanding during the period. Net income per share-diluted is calculated as net income available to common stockholders divided by the diluted weighted average number of common shares outstanding during the period, including the dilutive effect of nonvested restricted stock. The dilutive effect of nonvested restricted stock is calculated using the treasury stock method to determine the number of additional common shares that would become outstanding if the remaining unvested restricted stock awards vested. Outstanding stock options have been excluded from the diluted earnings per share calculation, as their impact would be anti-dilutive.

Income Taxes

Piedmont has elected to be taxed as a REIT under the Code, and has operated as such, beginning with its taxable year ended December 31, 1998. To qualify as a REIT, Piedmont must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its annual REIT taxable income. As a REIT, Piedmont is generally not subject to federal income taxes. Accordingly, neither a provision nor a benefit for federal income taxes has been made in the accompanying consolidated financial statements. Piedmont is subject to certain state and local taxes related to the operations of properties in certain locations, which have been provided for in the financial statements. Additionally, Piedmont conducts certain operations through its taxable REIT subsidiary, Piedmont Office Holdings, Inc. These operations resulted in estimated tax payments of approximately $8.5 thousand for the year ended December 31, 2012, which is recorded in the accompanying financial statements as general and administrative costs.

Reclassifications

Certain prior period amounts have been reclassified to conform to the current period financial statement presentation. The reclassifications relate to the required presentation of income from discontinued operations for the properties sold during the years ended December 31, 2012, 2011, and 2010. Please refer to Note 14 for further details. All such reclassifications do not affect net income attributable to Piedmont as presented in previous years.

Recent Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board issued Accounting Standards Update 2013-02, Comprehensive Income Topic Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income ("ASU 2013-02"). ASU 2013-02 requires an entity to disclose information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to disclose significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income if the amount reclassified to net income in its entirety in the same reporting period is required under GAAP. For amounts that are not required under GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under GAAP that provide additional detail about those amounts. ASU 2013-02 is effective for Piedmont for the interim period beginning January 1, 2013. The adoption of ASU 2013-02 is not expected to have a material impact on Piedmont's financial statements or disclosures.

3.    Acquisitions

During the year ended December 31, 2012, Piedmont's acquisition activity consisted of purchasing tracts of undeveloped land. On June 28, 2012, Piedmont purchased undeveloped land adjacent to the Medici building in Atlanta, Georgia for a purchase price of approximately $2.5 million. The undeveloped land consists of approximately 2.01 acres, is zoned for office and accessory use, and has a site plan approved for approximately 249,000 square feet.

On October 15, 2012, Piedmont purchased undeveloped land adjacent to the Glenridge Highlands II building in Atlanta, Georgia for a purchase price of approximately $1.7 million. The land consists of approximately 3.0 acres, is zoned for office use, and has a site plan approved for approximately 113,000 square feet.

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4.    Tenant Receivables

Tenant receivables as of December 31, 2012 and 2011, respectively, are as follows (in thousands):

	2012		2011
Tenant receivables, net of allowance for doubtful accounts of $346 and $631 as of December 31, 2012 and 2011, respectively	$	25,038	$	24,722
Cumulative rental revenue recognized on a straight-line basis in excess of cash received in accordance with lease terms	122,299		104,801
Tenant receivables	$	147,337	$	129,523

5.    Unconsolidated Joint Ventures

Investments in Unconsolidated Joint Ventures

As of December 31, 2012 and 2011, Piedmont owned interests in the following unconsolidated joint ventures (in thousands):

Name of Joint Venture	Properties Held by Joint Venture	Piedmont’s Approximate Ownership Percentage		Net Book Value
				2012		2011
Fund XIII and REIT Joint Venture	8560 Upland Drive Two Park Center	72	%	$	18,814	$	19,180
Fund XII REIT and Joint Venture	4685 Investment Drive 5301 Maryland Way	55	%	15,813		16,329
Fund XI, XII and REIT Joint Venture	20/20	57	%	2,599		2,672
				$	37,226	$	38,181

6.    Line of Credit and Notes Payable

During the year ended December 31, 2012, Piedmont OP entered into a new $500 million unsecured line of credit facility (the “$500 Million Unsecured Line of Credit”) with a consortium of lenders to replace its expiring $500 Million Unsecured Facility. The term of the $500 Million Unsecured Line of Credit is four years with an extended maturity date of August 21, 2017 (assuming Piedmont extends the term for an additional year through two available six month extensions). Additionally, under certain terms of the agreement, Piedmont may increase the new facility by up to an additional $500 million (to an aggregate size of $1.0 billion); however, none of the existing lenders have any obligation to participate in such increase. Piedmont paid customary fees to the lenders in connection with the closing of the new $500 Million Unsecured Line of Credit. The $500 Million Unsecured Line of Credit has the option to bear interest at varying levels based on (i) the London Interbank Offered Rate (“LIBOR”) or 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 one percent, (ii) the credit rating for Piedmont, and (iii) for LIBOR loans, 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. The stated interest rate spread over LIBOR can vary from 1.00% to 1.75% based upon the then current credit rating of Piedmont. As of December 31, 2012, the current stated LIBOR spread on the $500 Million Unsecured Line of Credit was 1.175%, and Piedmont had met all of the financial covenant requirements.

Other Financing Activity

During the year ended December 31, 2012, Piedmont fully repaid its $140 million mortgage which had been secured by the 500 W. Monroe building in Chicago, Illinois, and its $45 million loan which had been secured by the 4250 N. Fairfax building in Arlington, Virginia. Additionally, during the year ended December 31, 2012, Piedmont incurred net borrowings of approximately $129.0 million on its outstanding lines of credit.

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The following table summarizes the terms of Piedmont’s indebtedness outstanding as of December 31, 2012 and 2011 (in thousands):

Facility	Collateral	Rate(1)			Maturity	Amount Outstanding as of December 31,
						2012		2011
Secured (Fixed)
$45.0 Million Fixed-Rate Loan	4250 N. Fairfax	5.20	%		6/1/2012	$	—	$	45,000
$200.0 Million Mortgage Note	Aon Center	4.87	%		5/1/2014	200,000		200,000
$25.0 Million Mortgage Note	Aon Center	5.70	%		5/1/2014	25,000		25,000
$350.0 Million Secured Pooled Facility	Nine Property Collateralized Pool(2)	4.84	%		6/7/2014	350,000		350,000
$105.0 Million Fixed-Rate Loan	US Bancorp Center	5.29	%		5/11/2015	105,000		105,000
$125.0 Million Fixed-Rate Loan	Four Property Collateralized Pool(3)	5.50	%		4/1/2016	125,000		125,000
$42.5 Million Fixed-Rate Loan	Las Colinas Corporate Center I & II	5.70	%		10/11/2016	42,525		42,525
$140.0 Million WDC Mortgage Notes	1201 & 1225 Eye Street	5.76	%		11/1/2017	140,000		140,000
$140.0 Million 500 W. Monroe Mortgage Loan	500 W. Monroe	LIBOR +  1.008%			8/9/2012	—		140,000
Subtotal/Weighted Average(4)		5.17	%			987,525		1,172,525
Unsecured (Variable)
$300 Million Unsecured Term Loan		LIBOR +  1.45%		(5)	11/22/2016	300,000		300,000
$500 Million Unsecured Line of Credit		1.39	%	(6)	8/19/2016	129,000		—
Subtotal/Weighted Average(4)		2.30	%			429,000		300,000
Total/ Weighted Average(4)		4.30	%			$	1,416,525	$	1,472,525

⁽¹⁾  All of Piedmont’s outstanding debt as of December 31, 2012 and 2011 is interest-only debt.

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

⁽³⁾  Four property collateralized pool includes 1430 Enclave Parkway in Houston, Texas, Windy Point I and II in Schaumburg, Illinois, and 1055 East Colorado Boulevard in Pasadena, California.

⁽⁴⁾  Weighted average is based on contractual balance of outstanding debt and interest rates in the table as of December 31, 2012.

⁽⁵⁾  The $300 Million Unsecured Term Loan has a stated variable rate; however, Piedmont entered into interest rate swap agreements which effectively fix, exclusive of changes to Piedmont's credit rating, the rate on this facility to 2.69% through maturity.

⁽⁶⁾  Piedmont may select from multiple interest rate options with each draw, including the prime rate and various length LIBOR locks. All LIBOR selections are subject to an additional spread (1.175% as of December 31, 2012) over the selected rate based on Piedmont’s current credit rating. The outstanding balance as of December 31, 2012 consists of LIBOR draws at an average rate of 0.22% (subject to the additional spread mentioned above).

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A summary of the aggregate maturities of Piedmont’s indebtedness as of December 31, 2012, is provided below (in thousands):

2013	$	—
2014	575,000
2015	105,000
2016	596,525
2017	140,000
Thereafter	—
Total	$	1,416,525

Piedmont’s weighted-average interest rate as of December 31, 2012 and 2011, for aforementioned borrowings was approximately 4.30% and 4.29%, respectively. Piedmont made interest payments on all indebtedness, including interest rate swap cash settlements, of approximately $62.6 million, $66.7 million, and $70.2 million during the years ended December 31, 2012, 2011, and 2010, respectively.

7.    Variable Interest Entities

Variable interest holders who have the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and have the obligation to absorb the majority of losses of the entity or the right to receive significant benefits of the entity are considered to be the primary beneficiary and must consolidate the VIE.

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A summary of Piedmont’s interests in and consolidation treatment of its VIEs as of December 31, 2012 is as follows, (net carrying amount in millions):

Entity	Piedmont’s % Ownership of Entity		Related Building	Consolidated/ Unconsolidated	Net Carrying Amount as of December 31, 2012			Net Carrying Amount as of December 31, 2011			Primary Beneficiary Considerations
1201 Eye Street NW Associates, LLC	49.5	%	1201 Eye Street	Consolidated	$	(5.7	)	$	(3.4	)	In accordance with the partnership’s governing documents, Piedmont is entitled to 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building.
1225 Eye Street NW Associates, LLC	49.5	%	1225 Eye Street	Consolidated	$	(0.1	)	$	0.6		In accordance with the partnership’s governing documents, Piedmont is entitled to 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building.
Piedmont Multi-State Owner, LLC	100	%	1200 Crown Colony Drive	Consolidated	$	33.2		$	28.0		In accordance with a tenant's lease, if Piedmont sells the property on or before March 2013, then the tenant would be entitled to an equity participation fee; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
Piedmont 500 W. Monroe Fee, LLC	100	%	500 W. Monroe	Consolidated	$	194.0		$	76.9		The Omnibus Agreement with the previous owner includes equity participation rights for the previous owner, if certain financial returns are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
Suwanee Gateway One, LLC	100	%	Suwanee Gateway One	Consolidated	$	7.6		$	7.7		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
Medici Atlanta, LLC	100	%	The Medici	Consolidated	$	13.7		$	13.0		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
400 TownPark, LLC	100	%	400 TownPark	Consolidated	$	23.5		$	23.7		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.

Each of the VIEs described above has the sole purpose of holding office buildings and their resulting operations, and are classified in the accompanying consolidated balance sheets in the same manner as Piedmont's wholly-owned properties.

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8.    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 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. 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

During the year ended December 31, 2012, Piedmont used four interest rate swap agreements to hedge the variable cash flows associated with its $300 Million Unsecured Term Loan. Additionally, during the year ended December 31, 2012, Piedmont entered into a forward starting swap with a total notional value of $70.0 million to hedge the risk of changes in the interest payments associated with the potential issuance of long-term debt over a maximum period of 134 months.

A detail of Piedmont’s interest rate derivatives outstanding as of December 31, 2012 is as follows:

Interest Rate Derivatives:	Notional Amount (in millions)		Effective Date	Maturity Date
Interest rate swap	$	125	11/22/2011	11/22/2016
Interest rate swap	$	75	11/22/2011	11/22/2016
Interest rate swap	$	50	11/22/2011	11/22/2016
Interest rate swap	$	50	11/22/2011	11/22/2016
Interest rate swap	$	70	3/3/2014	3/3/2024
Total	$	370

All of Piedmont's interest rate swap agreements outstanding for the periods presented were designated as cash flow hedges of interest rate risk. As such, the effective portion of the changes in the fair value of these derivatives was recorded in other comprehensive income ("OCI") and subsequently reclassified into the accompanying consolidated statements of income for the years ended December 31, 2012, 2011, and 2010, respectively, as follows (in thousands):

Derivative in Cash Flow Hedging Relationships (Interest Rate Swaps and Caps)	2012			2011			2010
Amount of loss recognized in OCI on derivatives	$	7,656		$	3,064		$	1,529
Amount of previously recorded loss reclassified from accumulated OCI into interest expense	$	(3,033	)	$	(1,218	)	$	(4,704	)

Piedmont estimates that an additional $3.1 million will be reclassified from accumulated other comprehensive loss as an increase to interest expense over the next twelve months. No gain or loss was recognized related to hedge ineffectiveness or to amounts excluded from effectiveness testing on Piedmont’s cash flow hedges during the years ended December 31, 2012, 2011, or 2010.

Additionally, see Note 9 for fair value disclosures of Piedmont's derivative instruments.

Credit-risk-related Contingent Features

Piedmont has agreements with its derivative counterparties that contain a provision whereby if Piedmont defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then Piedmont could also be declared in default on its derivative obligation. If Piedmont breached any of the contractual provisions of the derivative contracts, it would be required to settle its obligations under the agreements at their termination value of the fair values plus accrued interest, or approximately $7.4 million.

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9.    Fair Value Measurements

Piedmont considers its cash, accounts receivable, restricted cash and escrows, accounts payable, interest rate swap agreements, and line of credit and notes payable to meet the definition of financial instruments. The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments as of December 31, 2012 and 2011, respectively (in thousands):

	2012					2011
Financial Instrument	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy	Carrying Value		Estimated Fair Value
Assets:
Cash and cash equivalents(1)	$	12,957	$	12,957	Level 1	$	139,690	$	139,690
Tenant and notes receivables, net(1)	$	147,337	$	147,337	Level 1	$	129,523	$	129,523
Restricted cash and escrows(1)	$	334	$	334	Level 1	$	9,039	$	9,039
Interest rate swap asset	$	1,075	$	1,075	Level 2	$	—	$	—
Liabilities:
Accounts payable and accrued expenses(1)	$	23,113	$	23,113	Level 1	$	14,637	$	14,637
Interest rate swap liability	$	8,235	$	8,235	Level 2	$	2,537	$	2,537
Line of credit and notes payable	$	1,416,525	$	1,470,002	Level 2	$	1,472,525	$	1,529,811

⁽¹⁾  For the periods presented, the carrying value approximates estimated fair value due to its short-term maturity.

Piedmont's line of credit and notes payable were carried at book value as of December 31, 2012 and 2011; however, Piedmont's estimate of their fair value is disclosed in the table above. Piedmont uses widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the debt facilities, including the period to maturity of each instrument, and uses observable market-based inputs for similar debt facilities which have transacted recently in the market. Therefore, the fair values determined are considered to be based on significant other observable inputs (Level 2). Scaling adjustments are made to these inputs to make them applicable to the remaining life of Piedmont's outstanding debt. Piedmont has not changed its valuation technique for estimating the fair value of its line of credit and notes payable.

Piedmont’s interest rate swap agreements discussed in Note 8 above are classified as both “Interest rate swap” assets and liabilities in the accompanying consolidated balance sheets and were carried at fair value as of December 31, 2012 and 2011. The valuation of these derivative instruments was determined using widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the derivatives, including the period to maturity of each instrument, and uses observable market-based inputs, including interest rate curves and implied volatilities. Therefore, the fair values determined are considered to be based on significant other observable inputs (Level 2). In addition, Piedmont considered both its own and the respective counterparties’ risk of nonperformance in determining the fair value of its derivative financial instruments by estimating the current and potential future exposure under the derivative financial instruments that both Piedmont and the counterparties were at risk for as of the valuation date. The credit risk of Piedmont and its counterparties was factored into the calculation of the estimated fair value of the interest rate swaps; however, as of December 31, 2012 and 2011, this credit valuation adjustment did not comprise a material portion of the estimated fair value. Therefore, Piedmont believes that any unobservable inputs used to determine the fair values of its derivative financial instruments are not significant to the fair value measurements in their entirety, and does not consider any of its derivative financial instruments to be Level 3 liabilities.

10.    Commitments and Contingencies

Commitments Under Existing Lease Agreements

Certain lease agreements include provisions that, at the option of the tenant, may obligate Piedmont to provide funding for capital improvements. Under its existing lease agreements, Piedmont may be required to fund significant tenant improvements, leasing commissions, and building improvements. In addition, certain agreements contain provisions that require Piedmont to issue corporate or property guarantees to provide funding for capital improvements or other financial obligations. Further, Piedmont classifies such tenant and building improvements into two classes: (i) improvements which incrementally enhance the building's asset value by expanding its revenue generating capacity (“incremental capital expenditures”) and (ii) improvements which maintain the building's existing asset value and its revenue generating capacity (“non-incremental capital expenditures”). As of December 31, 2012, Piedmont anticipates funding potential non-incremental capital expenditures for tenant improvements of approximately $111.9 million related to its existing lease portfolio over the respective lease terms, the majority of which Piedmont estimates may

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be required to be funded over the next several years. For most of Piedmont’s leases, the timing of the actual funding of these tenant improvements is largely dependent upon tenant requests for reimbursement. In some cases, these obligations may expire with the leases without further recourse to Piedmont.

Additionally, as of December 31, 2012, commitments for incremental capital expenditures associated with new leases, primarily at value-add properties, totals approximately $63.8 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 additional expense related to such tenant audits/disputes of approximately $0.2 million, $0.7 million and $0.4 million during the years ended December 31, 2012, 2011, and 2010, respectively.

Letters of Credit

As of December 31, 2012, Piedmont was subject to the following letters of credit, which reduce the total outstanding capacity under its $500 Million Unsecured Line of Credit:

Amount		Expiration of Letter of Credit (1)
$	10,000,000	July 2013
$	9,033,164	July 2013
$	382,556	July 2013

⁽¹⁾  These letter of credit agreements contain an “evergreen” clause, which automatically renews for consecutive, one-year periods each anniversary, subject to certain limitations.

Operating Lease Obligations

Three properties (the River Corporate Center building in Tempe, Arizona; the 8700 South Price Road building in Tempe, Arizona; and the 2001 NW 64^th Street building in Ft. Lauderdale, Florida) are subject to ground leases with expiration dates ranging between 2048 and 2101. The aggregate remaining payments required under the terms of these operating leases as of December 31, 2012 are presented below (in thousands):

2013	$	750
2014	750
2015	750
2016	750
2017	750
Thereafter	74,119
Total	$	77,869

Ground rent expense was approximately $0.8 million, $0.6 million, and $0.6 million for the years ended December 31, 2012, 2011, and 2010, respectively, and is included in property operating costs in the accompanying consolidated statements of income. The net book value of the real estate assets of the related office buildings subject to operating ground leases is approximately $31.8 million and $26.0 million as of December 31, 2012 and 2011, respectively.

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Agreements in Principle to Resolve Legal Actions

Piedmont and certain of its current and former officers and directors were party to two separate securities class action lawsuits which challenged various disclosures made in connection with Piedmont's April 2007 internalization transaction in one case and a response to a May 2007 tender offer for Piedmont's shares and an October 2007 proxy statement seeking approval of amendments to Piedmont's charter in the other case. (Please refer to Part I. Item 3 “Legal Proceedings” for a complete description of the chronology of the two lawsuits). During the year ended December 31, 2012, after receiving favorable rulings including the dismissal of all claims in both cases, Piedmont reached agreement in principle to settle both lawsuits, thus avoiding additional legal expense associated with any further appeals by the plaintiffs. As a result, during the year ended December 31, 2012, Piedmont recorded a $7.5 million litigation settlement charge in the accompanying financial statements (Please see Note 2 - Litigation Settlement Expense). The settlements are subject to court approval following notice to the classes. As such, the possibility of further financial loss does exist; however, management has concluded that such risk of loss is remote.

Other Legal Matters

Piedmont is from time to time a party to legal proceedings, which arise in the ordinary course of its business. None of these ordinary course legal proceedings are reasonably likely to have a material adverse effect on results of operations or financial condition.

11.    Stock Based Compensation

Deferred Stock Awards

Piedmont has granted deferred stock awards in the form of restricted stock to its employees. The awards are determined by the Compensation Committee of the board of directors of Piedmont on an annual basis and typically vest over a three-year period beginning on the grant date. In addition, Piedmont has adopted a multi-year performance share program for certain of its employees. Restricted shares are earned based on the relative performance of Piedmont's total stockholder return as compared with a predetermined peer group's total stockholder return over a three-year period. Any shares awarded vest immediately upon issuance.

A rollforward of Piedmont's deferred stock award activity for the year ended December 31, 2012 is as follows:

	Unvested Deferred Stock Awards as of January 1, 2012		Deferred Stock Awards Granted During Fiscal Year 2012		Adjustment to Estimated Future Grants of Performance Share Awards During the 2012			Deferred Stock Awards Vested During Fiscal Year 2012			Deferred Stock Awards Forfeited During Fiscal Year 2012			Unvested Deferred Stock Awards as of December 31, 2012
Shares	511,203		229,135		(159,474		)	(255,258		)	(6,713		)	318,893
Weighted-Average Grant Date Fair Value	$	21.67	$	17.53	$	23.64		$	20.89		$	18.52		$	18.41

The following table provides additional information regarding stock award activity during the years ended December 31, 2012, 2011, and 2010 (in thousands except for per share data):

	2012		2011		2010
Weighted-Average Grant Date Fair Value for Shares Granted During the Year	$	17.53	$	19.03	$	22.54
Total Grant Date Fair Value of Shares Vested During the Year	$	5,331	$	5,405	$	4,789
Share-based Liabilities Paid(1)	$	798	$	851	$	—

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

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A detail of Piedmont’s outstanding employee deferred stock awards as of December 31, 2012 is as follows:

Date of grant	Type of Award	Net  Shares Granted (1)		Grant Date Fair Value		Vesting Schedule	Unvested Shares as of December 31, 2012
May 11, 2010	2010-2012 Performance Share Program	56,875	(2)	$	28.44	Shares vest immediately upon determination of award in 2013.	5,266	(3)
May 24, 2010	Annual Deferred Stock Award	161,148		$	18.71	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 24, 2011, 2012, and 2013, respectively.	52,964
May 24, 2010	One-Time, Special Deferred Stock Award in Recognition of Piedmont's Initial Public Offering	40,085		$	18.71	Of the shares granted, 33.33% vested or will vest on May 24, 2011, 2012, and 2013, respectively.	17,457
April 5, 2011	Annual Deferred Stock Award	128,986		$	19.40	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 5, 2012, 2013, and 2014, respectively.	74,496
April 5, 2011	2011-2013 Performance Share Program	—		$	18.27	Shares vest immediately upon award in 2014.	—	(3)
April 4, 2012	Annual Deferred Stock Award	209,876		$	17.49	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 4, 2013, 2014, and 2015, respectively.	168,710
April 4, 2012	2012-2014 Performance Share Program	—		$	17.42	Shares vest immediately upon determination of award in 2015.	—	(3)
Total							318,893

⁽¹⁾  Amounts reflect the total grant, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2012.

⁽²⁾  Represents shares granted pursuant to the first and second interim performance periods ended December 31, 2010 and 2011, respectively.

⁽³⁾  Estimated based on Piedmont's cumulative total stockholder return relative to a predetermined peer group's cumulative total stockholder return for the respective performance period as of December 31, 2012. Such estimates are subject to change in future periods based on both Piedmont's and its peers' stock performance and dividends paid.

During the years ended December 31, 2012, 2011, and 2010, Piedmont recognized approximately $3.9 million, $6.5 million and $5.1 million of compensation expense and directors' fees related to stock awards, respectively, of which $2.5 million, $5.3 million and $3.7 million, respectively, related to the non-vested shares. During the year ended December 31, 2012, 181,502 shares were issued to employees, directors and officers. As of December 31, 2012, approximately $2.3 million of unrecognized compensation cost related to non-vested, share-based compensation remained, which Piedmont will record in its statements of income over a weighted-average vesting period of approximately one year.

12.    Earnings Per Share

There are no adjustments to “Net income attributable to Piedmont” or “Income from continuing operations” for the diluted earnings per share computations.

Net income per share-basic is calculated as net income available to common stockholders divided by the weighted average number of common shares outstanding during the period. Net income per share-diluted is calculated as net income available to common stockholders divided by the diluted weighted average number of common shares outstanding during the period, including the

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dilutive effect of nonvested restricted stock. The dilutive effect of nonvested restricted stock is calculated using the treasury stock method to determine the number of additional common shares that would become outstanding if the remaining unvested restricted stock awards vested. Outstanding stock options have been excluded from the diluted earnings per share calculation, as their impact would be anti-dilutive. The following table reconciles the denominator for the basic and diluted earnings per share computations shown on the consolidated statements of operations for the years ended December 2012, 2011, and 2010 (in thousands):

	2012	2011	2010
Weighted-average common shares—basic	170,312	172,765	170,753
Plus incremental weighted-average shares resulting from the assumed conversion of time-vested restricted stock awards	129	216	214
Weighted-average common shares—diluted	170,441	172,981	170,967

13.    Operating Leases

Piedmont’s real estate assets are leased to tenants under operating leases for which the terms vary, including certain provisions to extend the lease term, options for early terminations subject to specified penalties, and other terms and conditions as negotiated. Piedmont retains substantially all of the risks and benefits of ownership of the real estate assets leased to tenants. Amounts required as security deposits vary depending upon the terms of the respective leases and the creditworthiness of the tenant, however, generally they are not significant. Exposure to credit risk is limited to the extent that the receivables exceed this amount. Security deposits related to tenant leases are included in accounts payable and accrued expenses in the accompanying consolidated balance sheets.

Piedmont’s wholly-owned and consolidated joint venture properties are located in 17 metropolitan areas. Based on annualized lease revenue as of December 31, 2012, approximately 23.1%, 22.0%, and 14.6% of these real estate assets are located in metropolitan Chicago, metropolitan Washington, D.C., and metropolitan New York, respectively. Furthermore, approximately 13.3% of Piedmont's annualized lease revenue is generated from federal governmental agencies.

The future minimum rental income from Piedmont’s investment in real estate assets under non-cancelable operating leases, excluding unconsolidated joint ventures, as of December 31, 2012, is presented below (in thousands):

Years ending December 31:
2013	$	377,746
2014	349,565
2015	346,084
2016	310,798
2017	290,158
Thereafter	1,384,133
Total	$	3,058,484

14.    Discontinued Operations

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

Building Sold		Location	Date of Sale	Gain/(Loss) on Sale			Net Sales Proceeds
111 Sylvan Avenue	(1)	Englewood Cliffs, New Jersey	December 8, 2010	$	(817	)	$	51,637
Eastpointe Corporate Center		Issaquah, Washington	July 1, 2011	$	12,152		$	31,704
5000 Corporate Court		Holtsville, New York	August 31, 2011	$	14,367		$	36,100
35 West Wacker Drive	(2)	Chicago, Illinois	December 15, 2011	$	96,138		$	223,981
Portland Portfolio	(3)	Beaverton, Oregon	March 19, 2012	$	17,823		$	43,832
26200 Enterprise Way		Lake Forest, California	May 31, 2012	$	10,013		$	24,412
110 & 112 Hidden Lake Circle Buildings		Duncan, South Carolina	September 21, 2012	$	(259	)	$	25,595

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⁽¹⁾  Piedmont reclassified the operational results of the property, including a $9.6 million impairment charge that resulted from adjusting the assets to fair value, as discontinued operations in the accompanying 2010 statement of operations. The fair value measurement used in the evaluation of this non-financial asset was considered to be a Level 1 valuation within the fair value hierarchy as defined by GAAP, as there were direct observations and transactions involving the asset (i.e. the asset was sold to a third-party purchaser).

⁽²⁾  Piedmont sold its approximate 96.5% ownership in the property. Transaction data above is presented at Piedmont's ownership percentage.

⁽³⁾  The Portland Portfolio consisted of four office properties known as the Deschutes building, the Rhein building, the Rogue building, and the Willamette building, as well as 18.19 acres of adjoining, undeveloped land.

Income from Discontinued Operations

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

	Years Ended December 31,
	2012		2011			2010
Revenues:
Rental income	$	2,955	$	37,887		$	47,370
Tenant reimbursements	451		19,363			21,105
Lease termination income	—		304			2,761
	3,406		57,554			71,236
Expenses:
Property operating costs	564		21,576			23,305
Depreciation	848		6,926			9,223
Amortization of deferred leasing costs	148		5,517			7,418
General and administrative expenses	45		(170		)	507
	1,605		33,849			40,453
Other income (expense):
Interest expense	—		(5,932		)	(6,274		)
Interest and other income	—		1			2
Net income attributable to noncontrolling interest	—		(453		)	(516		)
	—		(6,384		)	(6,788		)
Operating income, excluding impairment loss and gain/(loss) on sale of real estate assets	1,801		17,321			23,995
Impairment loss	—		—			(9,587		)
Gain/(loss) on sale of real estate assets	27,577		122,657			(817		)
Income from discontinued operations	$	29,378	$	139,978		$	13,591

15.    Supplemental Disclosures of Noncash Activities

Significant noncash investing and financing activities for the years ended December 31, 2012, 2011, and 2010 (in thousands) are outlined below:

	2012			2011		2010
Accrued capital expenditures and deferred lease costs	$	12,598		$	8,218	$	8,047
Change in accrued offering costs related to issuance of common stock	$	(567	)	$	227	$	1,370
Net assets assumed upon consolidation of variable interest entity, net of notes receivable previously recorded	$	—		$	188,283	$	—
Liabilities assumed upon consolidation of variable interest entity	$	—		$	191,814	$	—
Redeemable common stock	$	—		$	—	$	75,164

F-27

16.    Income Taxes

Piedmont’s income tax basis net income for the years ended December 31, 2012, 2011, and 2010, is calculated as follows (in thousands):

	2012			2011			2010
GAAP basis financial statement net income	$	93,204		$	225,041		$	120,379
Increase (decrease) in net income resulting from:
Depreciation and amortization expense for financial reporting purposes in excess of amounts for income tax purposes	35,125			47,346			29,892
Rental income accrued for income tax purposes less than amounts for financial reporting purposes	(10,422		)	(9,380		)	(528		)
Net amortization of above/below-market lease intangibles for financial reporting purposes in excess of amounts for income tax purposes	(5,324		)	(6,605		)	(5,573		)
Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes	(7,967		)	(66,410		)	(9,254		)
Taxable income of Piedmont Washington Properties, Inc., in excess of amount for financial reporting purposes	2,662			4,515			5,096
Other expenses for financial reporting purposes in excess of amounts for income tax purposes	14,361			(2,072		)	9,570
Income tax basis net income, prior to dividends paid deduction	$	121,639		$	192,435		$	149,582

For income tax purposes, dividends to common stockholders are characterized as ordinary income, capital gains, or as a return of a stockholder’s invested capital. The composition of Piedmont’s distributions per common share is presented below:

	2012		2011		2010
Ordinary income	73	%	61	%	69	%
Capital gains	16	%	27	%	—
Return of capital	11	%	12	%	31	%
	100	%	100	%	100	%

At December 31, 2012, the tax basis carrying value of Piedmont’s total assets was approximately $4.1 billion.

Accrued interest and penalties related to uncertain tax positions are included in accounts payable, accrued expenses, and accrued capital expenditures in the accompanying consolidated balance sheets and represented approximately $6.7 million as of December 31, 2012 and 2011. Piedmont recorded no additional expense during the years ended December 31, 2012, 2011, and 2010, respectively, related to such positions. The tax years 2009 to 2012 remain open to examination by various federal and state taxing authorities.

17.    Quarterly Results (unaudited)

A summary of the unaudited quarterly financial information for the years ended December 31, 2012 and 2011, is presented below (in thousands, except per-share data). The amounts presented may have been restated from previous period presentations due to reclassifications related to discontinued operations (see Note 14 for further detail).

F-28

	2012
	First		Second		Third				Fourth
Revenues	$	132,320	$	133,092	$	134,891			$	136,079
Real estate operating income	$	34,542	$	35,624	$	33,947			$	35,665
Income from continuing operations	$	18,272	$	20,212	$	10,905		(1)	$	14,452		(2)
Income from discontinued operations	$	18,959	$	10,499	$	(70	)		$	(10	)
Net income attributable to Piedmont	$	37,227	$	30,708	$	10,831			$	14,438
Basic earnings per share	$	0.22	$	0.18	$	0.06			$	0.09
Diluted earnings per share	$	0.22	$	0.18	$	0.06			$	0.09
Dividends per share	$	0.2000	$	0.2000	$	0.2000			$	0.2000

⁽¹⁾  Includes $7.5 million of litigation settlement expense related to agreements in principle to settle Piedmont's two outstanding class action lawsuits.

⁽²⁾  Includes $5.2 million in net casualty loss due to damage and related expenses incurred as a result of Hurricane Sandy.

	2011
	First		Second		Third		Fourth
Revenues	$	130,216	$	135,176	$	132,478	$	135,623
Real estate operating income	$	39,710	$	35,452	$	36,341	$	32,428
Income from continuing operations	$	29,658	$	17,403	$	20,499	$	17,518
Income from discontinued operations	$	4,313	$	3,628	$	30,531	$	101,506
Net income attributable to Piedmont	$	33,967	$	21,028	$	51,026	$	119,020
Basic earnings per share	$	0.20	$	0.12	$	0.30	$	0.68
Diluted earnings per share	$	0.20	$	0.12	$	0.29	$	0.69
Dividends per share	$	0.3150	$	0.3150	$	0.3150	$	0.3150

18.    Subsequent events

Declaration of Dividend for the First Quarter 2013

On February 27, 2013, the board of directors of Piedmont declared dividends for the first quarter 2013 in the amount of $0.20 (20.00 cents) per share on its common stock to stockholders of record as of the close of business on March 8, 2013. Such dividends are to be paid on March 22, 2013.

Contract to Purchase Asset in Washington, D.C.

On February 13, 2013, Piedmont entered into a binding contract to purchase an office property located in Washington, D.C. for approximately $175.6 million, with an anticipated close date in March 2013.

F-29

Piedmont Office Realty Trust, Inc.

Schedule III - Real Estate and Accumulated Depreciation

December 31, 2012

(dollars in thousands)

					Initial Cost					Gross Amount at Which Carried at December 31, 2012
Description	Location	Ownership Percentage		Encumbrances	Land	Buildings and Improvements	Total	Costs Capitalized Subsequent to Acquisition		Land	Buildings and Improvements	Total	Accumulated Depreciation and Amortization	Date of Construction	Date Acquired	Life on which Depreciation and Amortization is Computed (in years) (f)
3900 DALLAS PARKWAY	Plano, TX	100	%	None	1,456	20,377	21,837	3,047		1,517	23,367	24,884	8,826	1999	12/21/1999	0	-	40
RIVER CORPORATE CENTER	Tempe, AZ	100	%	(a)	—	16,036	16,036	7,309		—	23,345	23,345	6,291	1998	3/29/2000	0	-	40
8700 SOUTH PRICE ROAD	Tempe, AZ	100	%	(a)	—	13,272	13,272	551		—	13,823	13,823	4,902	2000	6/12/2000	0	-	40
1441 WEST LONG LAKE ROAD	Troy, MI	100	%	None	2,160	16,776	18,936	(6,760	)	1,202	10,974	12,176	6,766	1999	6/29/2000	0	-	40
1111 DURHAM AVENUE	South Plainfield, NJ	100	%	None	9,653	20,495	30,148	(11,547	)	3,728	14,873	18,601	8,378	1975	11/1/2000	0	-	40
1430 ENCLAVE PARKWAY	Houston, TX	100	%	32,100	7,100	37,915	45,015	3,700		5,506	43,209	48,715	14,686	1994	12/21/2000	0	-	40
CRESCENT RIDGE II	Minnetonka, MN	100	%	None	7,700	45,154	52,854	7,954		8,021	52,787	60,808	19,404	2000	12/21/2000	0	-	40
1200 CROWN COLONY DRIVE (c)	Quincy, MA	100	%	20,200	11,042	40,666	51,708	1,970		11,042	42,636	53,678	13,020	1990	7/30/2001	0	-	40
5601 HIATUS ROAD	Tamarac, FL	100	%	None	3,642	10,404	14,046	1,722		3,642	12,126	15,768	3,404	2001	12/21/2001	0	-	40
WINDY POINT I	Schaumburg, IL	100	%	23,400	4,537	31,847	36,384	2,341		4,537	34,188	38,725	10,157	1999	12/31/2001	0	-	40
WINDY POINT II	Schaumburg, IL	100	%	40,300	3,746	55,026	58,772	1,096		3,746	56,122	59,868	16,575	2001	12/31/2001	0	-	40
SARASOTA COMMERCE CENTER II	Sarasota, FL	100	%	None	1,767	20,533	22,300	2,249		2,203	22,346	24,549	6,732	1999	1/11/2002	0	-	40
11695 JOHNS CREEK PARKWAY	Johns Creek, GA	100	%	None	2,080	13,572	15,652	1,648		2,081	15,219	17,300	4,695	2001	3/28/2002	0	-	40
3750 BROOKSIDE PARKWAY	Alpharetta, GA	100	%	None	1,561	14,207	15,768	112		1,561	14,319	15,880	4,189	2001	4/18/2002	0	-	40
2001 NW 64th STREET	Ft. Lauderdale, FL	100	%	(a)	—	7,172	7,172	769		—	7,941	7,941	2,177	2001	4/18/2002	0	-	40
90 CENTRAL STREET	Boxborough, MA	100	%	None	3,642	29,497	33,139	2,630		3,642	32,127	35,769	9,799	2001	5/3/2002	0	-	40
DESERT CANYON 300	Phoenix, AZ	100	%	None	2,602	24,333	26,935	100		2,602	24,433	27,035	6,906	2001	6/4/2002	0	-	40
6031 CONNECTION DRIVE	Irving, TX	100	%	None	3,157	43,656	46,813	2,419		3,157	46,075	49,232	12,465	1999	8/15/2002	0	-	40
6021 CONNECTION DRIVE	Irving, TX	100	%	None	3,157	42,662	45,819	1,397		3,157	44,059	47,216	12,756	2000	8/15/2002	0	-	40
6011 CONNECTION DRIVE	Irving, TX	100	%	None	3,157	29,034	32,191	2,586		3,157	31,620	34,777	9,395	1999	8/15/2002	0	-	40
BRAKER POINTE III (c)	Austin, TX	100	%	16,500	6,098	34,492	40,590	1		6,099	34,492	40,591	9,544	2001	8/15/2002	0	-	40
CHANDLER FORUM	Chandler, AZ	100	%	None	2,632	—	2,632	19,917		2,779	19,770	22,549	6,334	2003	9/12/2002	0	-	40

S- 1

					Initial Cost					Gross Amount at Which Carried at December 31, 2012
Description	Location	Ownership Percentage		Encumbrances	Land	Buildings and Improvements	Total	Costs Capitalized Subsequent to Acquisition		Land	Buildings and Improvements	Total	Accumulated Depreciation and Amortization	Date of Construction	Date Acquired	Life on which Depreciation and Amortization is Computed (in years) (f)
2 GATEHALL DRIVE (c)	Parsippany, NJ	100	%	42,700	9,054	96,722	105,776	33		9,054	96,755	105,809	26,514	1985	9/27/2002	0	-	40
350 SPECTRUM LOOP	Colorado  Springs, CO	100	%	None	2,185	24,964	27,149	(1,894	)	2,186	23,069	25,255	6,313	2001	9/27/2002	0	-	40
5601 HEADQUARTERS DRIVE	Plano, TX	100	%	None	3,153	24,602	27,755	2,663		3,153	27,265	30,418	6,797	2001	9/27/2002	0	-	40
TWO INDEPENDENCE SQUARE (c)	Washington, DC	100	%	105,800	52,711	202,702	255,413	21,374		52,711	224,076	276,787	55,720	1991	11/22/2002	0	-	40
ONE INDEPENDENCE SQUARE (c)	Washington, DC	100	%	57,800	29,765	104,814	134,579	2,770		30,562	106,787	137,349	28,479	1991	11/22/2002	0	-	40
2120 WEST END AVENUE (c)	Nashville, TN	100	%	26,800	4,908	59,011	63,919	6,671		5,100	65,490	70,590	17,776	2000	11/26/2002	0	-	40
800 NORTH BRAND BOULEVARD	Glendale, CA	100	%	None	23,605	136,284	159,889	8,900		23,607	145,182	168,789	39,209	1990	12/20/2002	0	-	40
EASTPOINT I	Mayfield  Heights, OH	100	%	None	1,485	11,064	12,549	423		1,485	11,487	12,972	2,972	2000	1/9/2003	0	-	40
EASTPOINT II	Mayfield Heights, OH	100	%	None	1,235	9,199	10,434	1,895		1,235	11,094	12,329	3,155	2000	1/9/2003	0	-	40
150 WEST JEFFERSON	Detroit, MI	100	%	None	9,759	88,364	98,123	3,846		9,759	92,210	101,969	25,154	1989	3/31/2003	0	-	40
US BANCORP CENTER	Minneapolis, MN	100	%	105,000	11,138	175,629	186,767	7,614		11,138	183,243	194,381	46,382	2000	5/1/2003	0	-	40
AON CENTER	Chicago, IL	100	%	225,000	23,267	472,488	495,755	125,542		23,966	597,331	621,297	143,225	1972	5/9/2003	0	-	40
AUBURN HILLS CORPORATE CENTER	Auburn Hills, MI	100	%	None	1,978	16,570	18,548	(8,159	)	1,591	8,798	10,389	3,763	2001	5/9/2003	0	-	40
11107 SUNSET HILLS ROAD	Reston, VA	100	%	None	2,711	17,890	20,601	1,371		2,711	19,261	21,972	4,901	1985	6/27/2003	0	-	40
11109 SUNSET HILLS ROAD	Reston, VA	100	%	None	1,218	8,038	9,256	(2,338	)	1,218	5,700	6,918	1,490	1984	6/27/2003	0	-	40
9211 CORPORATE BOULEVARD	Rockville, MD	100	%	None	3,019	21,984	25,003	(4,844	)	2,960	17,199	20,159	4,186	1989	7/30/2003	0	-	40
9221 CORPORATE BOULEVARD	Rockville, MD	100	%	None	3,019	21,984	25,003	(4,822	)	2,960	17,221	20,181	4,194	1989	7/30/2003	0	-	40
GLENRIDGE HIGHLANDS TWO	Atlanta, GA	100	%	None	6,662	69,031	75,693	(22,036	)	6,662	46,995	53,657	11,536	2000	8/1/2003	0	-	40
200 BRIDGEWATER CROSSING (c)	Bridgewater, NJ	100	%	40,200	8,182	84,160	92,342	(17,783	)	8,328	66,231	74,559	14,672	2002	8/14/2003	0	-	40
1055 EAST COLORADO BOULEVARD	Pasadena, CA	100	%	29,200	6,495	30,265	36,760	(8,338	)	6,495	21,927	28,422	5,494	2001	8/22/2003	0	-	40
FAIRWAY CENTER II (c)	Brea, CA	100	%	10,700	7,110	15,600	22,710	(2,298	)	7,110	13,302	20,412	3,003	2002	8/29/2003	0	-	40
COPPER RIDGE CENTER	Lyndhurst, NJ	100	%	None	6,974	38,714	45,688	(5,675	)	6,974	33,039	40,013	8,408	1989	9/5/2003	0	-	40

S- 2

					Initial Cost					Gross Amount at Which Carried at December 31, 2012
Description	Location	Ownership Percentage		Encumbrances	Land	Buildings and Improvements	Total	Costs Capitalized Subsequent to Acquisition		Land	Buildings and Improvements	Total	Accumulated Depreciation and Amortization	Date of Construction	Date Acquired	Life on which Depreciation and Amortization is Computed (in years) (f)
1901 MAIN STREET	Irvine, CA	100	%	None	6,246	36,455	42,701	(5,019	)	6,246	31,436	37,682	8,681	2001	9/17/2003	0	-	40
400 VIRGINIA AVE	Washington, DC	100	%	None	22,146	49,740	71,886	(1,856	)	22,146	47,884	70,030	11,467	1985	11/19/2003	0	-	40
4250 NORTH FAIRFAX DRIVE	Arlington, VA	100	%	45,000	13,636	70,918	84,554	5,098		13,636	76,016	89,652	21,922	1998	11/19/2003	0	-	40
1225 EYE STREET (d)	Washington, DC	50	%	57,600	21,959	47,602	69,561	(2,559	)	21,959	45,043	67,002	11,262	1986	11/19/2003	0	-	40
1201 EYE STREET (e)	Washington, DC	50	%	82,400	31,985	63,139	95,124	(3,133	)	31,985	60,006	91,991	13,985	2001	11/19/2003	0	-	40
1901 MARKET STREET	Philadelphia, PA	100	%	None	13,584	166,683	180,267	137		20,829	159,575	180,404	44,068	1987	12/18/2003	0	-	40
60 BROAD STREET	New York, NY	100	%	None	32,522	168,986	201,508	(5,994	)	60,708	134,806	195,514	33,533	1962	12/31/2003	0	-	40
1414 MASSACHUSETTS AVENUE	Cambridge, MA	100	%	None	4,210	35,821	40,031	1,988		4,365	37,654	42,019	13,114	1873	1/8/2004	0	-	40
ONE BRATTLE SQUARE	Cambridge, MA	100	%	None	6,974	64,940	71,914	(3,814	)	7,113	60,987	68,100	23,204	1991	2/26/2004	0	-	40
600 CORPORATE DRIVE	Lebanon, NJ	100	%	None	3,934	—	3,934	16,281		3,934	16,281	20,215	4,561	2005	3/16/2004	0	-	40
1075 WEST ENTRANCE DRIVE	Auburn Hills,  MI	100	%	None	5,200	22,957	28,157	(313	)	5,207	22,637	27,844	4,694	2001	7/7/2004	0	-	40
3100 CLARENDON BOULEVARD	Arlington, VA	100	%	None	11,700	69,705	81,405	(5,363	)	11,791	64,251	76,042	12,864	1987	12/9/2004	0	-	40
9200 CORPORATE BOULEVARD	Rockville, MD	100	%	None	3,730	16,608	20,338	(1,624	)	3,882	14,832	18,714	2,987	1982	12/29/2004	0	-	40
400 BRIDGEWATER CROSSING (c)	Bridgewater, NJ	100	%	29,300	10,400	71,052	81,452	(8,218	)	10,400	62,834	73,234	15,093	2002	2/17/2006	0	-	40
LAS COLINAS CORPORATE CENTER I	Irving, TX	100	%	17,500	3,912	18,830	22,742	(2,279	)	2,543	17,920	20,463	6,527	1998	8/31/2006	0	-	40
LAS COLINAS CORPORATE CENTER II	Irving, TX	100	%	25,025	4,496	29,881	34,377	(7,083	)	2,543	24,751	27,294	4,591	1998	8/31/2006	0	-	40
TWO PIERCE PLACE	Itasca, IL	100	%	None	4,370	70,632	75,002	1,667		4,370	72,299	76,669	16,258	1991	12/7/2006	0	-	40
2300 CABOT DRIVE	Lisle, IL	100	%	None	4,390	19,549	23,939	(2,849	)	4,390	16,700	21,090	4,640	1998	5/10/2007	0	-	40
PIEDMONT POINTE I	Bethesda, MD	100	%	None	11,200	58,606	69,806	7,339		11,200	65,945	77,145	8,407	2007	11/13/2007	0	-	40
PIEDMONT POINTE II	Bethesda, MD	100	%	None	13,300	70,618	83,918	6,279		13,300	76,897	90,197	8,670	2008	6/25/2008	0	-	40
SUWANEE GATEWAY ONE	Suwanee, GA	100	%	None	1,000	6,875	7,875	78		1,000	6,953	7,953	405	2008	9/28/2010	0	-	40
ONE MERIDIAN CROSSINGS	Richfield, MN	100	%	None	2,919	24,398	27,317	(1	)	2,919	24,397	27,316	1,550	1997	10/1/2010	0	-	40
TWO MERIDIAN CROSSINGS	Richfield, MN	100	%	None	2,661	25,742	28,403	99		2,661	25,841	28,502	1,824	1998	10/1/2010	0	-	40
1200 ENCLAVE PARKWAY	Houston, TX	100	%	None	3,460	15,047	18,507	6,189		3,460	21,236	24,696	949	1999	3/30/2011	0	-	40
500 W. MONROE	Chicago, IL	100	%	140,000	36,990	185,113	222,103	(20,929	)	36,990	164,184	201,174	8,565	1991	3/31/2011	0	-	40
THE DUPREE	Atlanta, GA	100	%	None	4,080	14,310	18,390	55		4,080	14,365	18,445	1,067	1997	4/29/2011	0	-	40
THE MEDICI	Atlanta, GA	100	%	None	1,780	11,510	13,290	728		1,780	12,238	14,018	777	2008	6/7/2011	0	-	40

S- 3

					Initial Cost									Gross Amount at Which Carried at December 31, 2012
Description	Location	Ownership Percentage		Encumbrances	Land		Buildings and Improvements		Total		Costs Capitalized Subsequent to Acquisition			Land		Buildings and Improvements		Total		Accumulated Depreciation and Amortization		Date of Construction	Date Acquired	Life on which Depreciation and Amortization is Computed (in years) (f)
225 PRESIDENTIAL WAY	Boston, MA	100	%	None	3,626		36,916		40,542		(764		)	3,612		36,166		39,778		2,038		2000	9/13/2011	0	-	40
235 PRESIDENTIAL WAY	Boston, MA	100	%	None	4,154		44,048		48,202		(911		)	4,138		43,153		47,291		2,421		2001	9/13/2011	0	-	40
400 TOWNPARK	Lake Mary, FL	100	%	None	2,570		20,555		23,125		580			2,570		21,135		23,705		1,029		2008	11/10/2011	0	-	40
PIEDMONT POWER, LLC (g)	Bridgewater, NJ	100	%	None	—		79		79		3,079			—		3,158		3,158		—		N/A	12/20/2011	0	-	40
UNDEVELOPED LAND PARCELS (b)	Various	100	%	None	6,021		427		6,448		2,987			9,435		—		9,435		—		N/A	Various			N/A
Total—Consolidated REIT Properties					$	599,677	$	3,834,947	$	4,434,624	$	130,001		$	629,536	$	3,935,093	$	4,564,629	$	951,897

S- 4

					Initial Cost									Gross Amount at Which Carried at December 31, 2012
Description	Location	Ownership Percentage		Encumbrances	Land		Buildings and Improvements		Total		Costs Capitalized Subsequent to Acquisition			Land		Buildings and Improvements		Total		Accumulated Depreciation and Amortization		Date of Construction	Date Acquired	Life on which Depreciation and Amortization is Computed (in years) (f)
20/20	Leawood, KS	57	%	None	1,696		7,851		9,547		(1,259		)	1,767		6,521		8,288		3,906		1992	7/2/1999	0	-	40
4685 INVESTMENT DRIVE	Troy, MI	55	%	None	2,144		9,984		12,128		2,902			2,233		12,797		15,030		6,029		2000	5/10/2000	0	-	40
5301 MARYLAND WAY	Brentwood, TN	55	%	None	4,300		20,702		25,002		1,360			4,479		21,883		26,362		7,242		1989	5/15/2001	0	-	40
8560 UPLAND DRIVE	Parker, CO	72	%	None	1,954		11,216		13,170		1,084			2,048		12,206		14,254		3,612		2001	12/21/2001	0	-	40
TWO PARK CENTER	Hoffman Estates, IL	72	%	None	600		22,682		23,282		(2,941		)	624		19,717		20,341		5,082		1999	9/19/2003	0	-	40
Total – Unconsolidated JV Properties					$	10,694	$	72,435	$	83,129	$	1,146		$	11,151	$	73,124	$	84,275	$	25,871
Total – All Properties					$	610,371	$	3,907,382	$	4,517,753	$	131,147		$	640,687	$	4,008,217	$	4,648,904	$	977,768

^(a)  Property is owned subject to a long-term ground lease.

^(b)  Undeveloped Land Parcels are not included in Piedmont’s total building count.

^(c)  These properties collateralize the $350 Million Secured Pooled Facility.

^(d)  Piedmont purchased all of the membership interest in 1225 Equity, LLC, which own a 49.5% membership interest in 1225 Eye Street, N.W. Associates, which owns the 1225 Eye Street building. As a result of its ownership of 1225 Equity, LLC, Piedmont owns an approximate 49.5% in the 1225 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.

^(e)  Piedmont purchased all of the membership interest in 1201 Equity, LLC, which own a 49.5% membership interest in 1201 Eye Street, N.W. Associates, which owns the 1201 Eye Street building. As a result of its ownership of 1201 Equity, LLC, Piedmont owns an approximate 49.5% in the 1201 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.

^(f)  Piedmont’s assets are depreciated or amortized using the straight-lined method over the useful lives of the assets by class. Generally, Tenant Improvements are amortized over the shorter of economic life or lease term, and Lease Intangibles are amortized over the lease term. Generally, Building Improvements are depreciated over 5 - 25 years, Land Improvements are depreciated over 20 - 25 years, and Buildings are depreciated over 40 years.

^(g)  Represents solar panels at the 400 Bridgewater Crossing building, which are not included in Piedmont’s total building count.

S- 5

Piedmont Office Realty Trust, Inc.

Schedule III - Real Estate and Accumulated Depreciation

December 31, 2012

(dollars in thousands)

	2012			2011			2010
Real Estate:
Balance at the beginning of the year	$	4,699,311		$	4,666,188		$	4,681,313
Additions to/improvements of real estate	108,131			440,141			105,282
Assets disposed	(77,768		)	(361,397		)	(72,586		)
Assets impaired	—			—			(8,489		)	(2)
Write-offs of intangible assets(1)	(73,632		)	(35,916		)	—
Write-offs of fully depreciated/amortized assets	(7,138		)	(9,705		)	(39,332		)
Balance at the end of the year	$	4,648,904		$	4,699,311		$	4,666,188
Accumulated Depreciation and Amortization:
Balance at the beginning of the year	$	935,716		$	918,578		$	840,545
Depreciation and amortization expense	139,196			147,440			131,000
Assets disposed	(16,374		)	(84,681		)	(13,519		)
Write-offs of intangible assets(1)	(73,632		)	(35,916		)	—
Write-offs of fully depreciated/amortized assets	(7,138		)	(9,705		)	(39,448		)
Balance at the end of the year	$	977,768		$	935,716		$	918,578

⁽¹⁾  Consists of write-offs of intangible lease assets related to lease restructurings, amendments and terminations.

⁽²⁾  Piedmont recorded an impairment charge against real estate assets of approximately $7.0 million related to the 111 Sylvan Avenue building at the time it was classified as held-for-sale in May 2010. This wholly-owned asset was subsequently sold in December 2010. In addition, the Fund IX, Fund XI, and REIT Joint Venture recorded an impairment loss on real estate assets of approximately $1.4 million during 2010 related to the 360 Interlocken building; however, Piedmont recorded its proporationate share of the charge (approximately $53,000) in the accompanying consolidated statements of income with other such net property operations as equity in income of unconsolidated joint ventures.

S- 6

EX-10.41

Exhibit 10.41

October 4, 2012                                

Robert K. Wiberg

3016 N Pollard Street

Arlington, VA 22207

Dear Bob:

On behalf of Piedmont Office Realty Trust, Inc. we are pleased to offer you the full-time position of EVP-Mid-Atlantic Region and Head of Development reporting to Donald A. Miller, President & CEO. We feel that you will be a valuable addition to Piedmont and look forward to having you as a part of our team. We are confident you will find Piedmont an employee-focused organization that will support you in achieving your professional goals. Outlined below are the details of our offer of employment.

Compensation: You will be paid a bi-weekly salary of $11,538.46 less applicable taxes and deductions, which is equivalent to an annual salary of $300,000.00. This position is considered exempt for purposes of federal wage and hour law, which means you are not eligible to receive overtime compensation for hours worked in excess of 40 in a given workweek.

Sign-on Bonus: Upon employment, you are eligible for a total award of $360,000 of shares of common stock of Piedmont Office Realty Trust under the Company's Long-Term Incentive Compensation Plan (LTIC). The shares will be granted under the Piedmont Office Realty Trust Inc. 2007 Omnibus Plan and will vest 25% upon grant date and 25% annually thereafter.

Incentive Bonus: You are eligible for a target bonus up to $200,000 in Piedmont's Annual Incentive Plan for the 2013 calendar year. Your incentive bonus for the 2012 calendar year will be targeted at 50% to 60% of your 2013 target bonus. The plan is based on both company and individual performance and is designed to encourage and reward the attainment of established business goals. Bonuses are paid solely at the discretion of the company and subject to applicable taxes. In order to be eligible, you must be employed at the time the incentive bonus payments are issued. The company reserves the right to amend, suspend or terminate this Plan at any time.

Start Date: Your start date will be whenever mutually agreed upon.

Employee Benefit Plans: We offer a comprehensive benefits package. Detailed benefits information is enclosed. You are eligible for benefits coverage beginning with the first day of employment, provided all necessary paperwork is completed and returned to Human Resources in a timely manner.

Omnibus Incentive Plan: Piedmont Office Realty Trust has an employee stock incentive program in which you will be eligible to participate after your employment begins. This plan is based upon achieving certain company-wide operating goals. A complete description of this plan is available in Human Resources department.

You are eligible for $150,000 of common stock of Piedmont Office Realty Trust under the company's 2012 Employee Restricted Stock Plan. In 2013, you will be eligible for a target award equal to one-hundred twenty-five percent (125%) of your annual salary, awarded in shares of common stock of Piedmont Office Realty Trust under the Company's Long-Term Incentive Compensation Plan (LTIC). One-half of the shares will be covered under the Employee Restricted Stock Plan and one-half under the 2013 Officer Performance Shares Plan.

Change of Control Termination and Termination without Cause: If your employment with Piedmont is terminated within twenty-four months of your first day of employment (i) due to a “Change in Control” (as defined in the 2007 Omnibus Incentive Plan) or (ii) due to a termination without “cause” (as defined in the March 28, 2012 Proxy Statement), you shall be entitled to receive as severance, the sum of: (i) your annual salary at the time of termination, (ii) an amount equal to a pro-rated portion of the annual Short-Term Annual Incentive that otherwise would have been paid for the portion of the fiscal year in which such termination occurs, and (iii) a prorated portion of your outstanding eligible LTIP Award(s) based on Piedmont's TSR relative to the TSR of the companies in the Peer Group prorated for the period ending as of the date of your termination of employment over the respective LTIP period(s). In addition, (during your first twenty-four months of employment) all unvested shares that are outstanding in your Restricted Stock Awards on the date of termination due to a Change in Control or due to a termination without cause will vest upon such termination. The resulting amounts shall be due from Piedmont within 90 days after your termination of employment occurs.

Piedmont Office Realty Trust, Inc. is an “at-will” employer and operates under the provision that employees have the right to resign their positions at any time, with or without notice, and with or without cause. We, the employer, have similar rights to terminate the employment relationship at any time, with or without cause.

As part of our new hire process, you will be asked to complete a Form I-9 in compliance with the Immigration Reform and Control Act. As part of this compliance, you must present us with documents which identify you and indicate you are eligible to work in the United States. This must be done within three days of hire. You will need to complete and submit benefits enrollment forms within 30 days of your date of hire.

Please sign this letter in the space provided below, thereby signifying your agreement with the information noted above, and return the original signed letter to us prior to your first day of employment.

Should you have questions concerning any of the information provided in this letter, or with regard to other provisions concerning your employment, please do not hesitate to contact me.

Best regards,

/s/ Donald A. Miller, CFA

Donald A. Miller, CFA^® 

President & Chief Executive Officer

Enclosure

Position Accepted:

/s/ Robert K. Wiberg     10/17/2012

Signature            Date

EX-21.1

Exhibit 21.1

Subsidiaries of Piedmont Office Realty Trust, Inc. and Piedmont Operating Partnership, LP

Subsidiary	State of Organization
Piedmont Operating Partnership, LP	Delaware
Piedmont Washington Properties, Inc.	Maryland
Piedmont Office Holdings, Inc.	Georgia
Piedmont Office Management, LLC	Georgia
Piedmont Government Services, LLC	Georgia
Piedmont Leasing, LLC	Delaware
Piedmont Power, LLC	Delaware
Piedmont-Las Colinas Springing Member, LLC (f/k/a Wells REIT-Springing Member, LLC)	Delaware
Piedmont 1901 Market Business Trust (f/k/a Wells 1901 Market Business Trust)	Delaware
Piedmont 1901 Market LLC (f/k/a Wells 1901 Market LLC)	Delaware
1055 East Colorado-Pasadena, CA GP, LLC (f/k/a Wells REIT-Pasadena, CA GP, LLC)	Delaware
1055 East Colorado-Pasadena, CA, L.P. (f/k/a Wells REIT-Pasadena, CA, L.P.)	Delaware
Piedmont-Montgomery, LLC (f/k/a Wells REIT-Montgomery, LLC)	Delaware
Piedmont Bridgewater I, LLC (f/k/a Wells Bridgewater I, LLC)	Delaware
Piedmont-Bridgewater, NJ, LLC (f/k/a Wells REIT-Bridgewater, NJ, LLC)	Delaware
Piedmont-Independence Square, LLC (f/k/a Wells REIT - Independence Square, LLC)	Delaware
Piedmont-3100 Clarendon LLC (f/k/a Wells REIT I-3100 Clarendon LLC)	Delaware
Piedmont-Shady Grove V LLC (f/k/a Wells REIT I-Shady Grove V LLC)	Delaware
Piedmont-1075 West Entrance, LLC (f/k/a Wells REIT I-1075 West Entrance, LLC)	Delaware
Piedmont-Multi-State Owner, LLC (f/k/a Wells REIT-Multi-State Owner, LLC)	Delaware
Piedmont-Nashville, TN, LLC (f/k/a Wells REIT-Nashville, TN, LLC)	Delaware
Piedmont-Braker Pointe Austin, TX, L.P. (f/k/a Wells REIT-Austin, TX, L.P.)	Delaware
Piedmont-Braker Pointe Austin, TX GP, LLC (f/k/a Wells REIT-Austin, TX, LLC)	Delaware
Fairway Center II-Orange County, CA, L.P. (f/k/a Wells REIT-Orange County, CA, L.P.)	Delaware
Fairway Center II-Orange County, CA, GP LLC (f/k/a Wells REIT-Orange County, CA, LLC)	Delaware
Piedmont-One Brattle Square I, LLC (f/k/a Wells REIT-One Brattle Square I, LLC)	Delaware
Piedmont-One Brattle Square II, LLC (f/k/a Wells REIT-One Brattle Square II, LLC)	Delaware
4250 North Fairfax Property LLC	Delaware
4250 N. Fairfax Owner, LLC	Delaware
400 Virginia Avenue LLC	Delaware
1200 Enclave Parkway, LLC	Delaware
1201 Eye Street, N.W. Associates LLC	Delaware
1215 ESDI, LLC	Delaware
1225 Equity LLC	Delaware
1225 Eye Street, N.W. Associates LLC	Delaware
1201 Equity LLC	Delaware
TTF Lending LLC	Delaware
TZO Lending LLC	Delaware
Piedmont-Two Pierce Place, LLC (f/k/a Wells REIT-Two Pierce Place, LLC)	Delaware
Piedmont-Las Colinas Corporate Center I, LP (f/k/a Wells REIT-Las Colinas Corporate Center I, LP)	Delaware
Piedmont-Las Colinas Corporate Center I, GP, LLC (f/k/a Wells REIT-Las Colinas Corporate Center I, LLC)	Delaware

Piedmont-Las Colinas Corporate Center II, LP (f/k/a Wells REIT-Las Colinas Corporate Center II, LP)	Delaware
Piedmont-Las Colinas Corporate Center II, GP, LLC (f/k/a Wells REIT-Las Colinas Corporate Center II, LLC)	Delaware
Cypress Concourse A, LLC	Delaware
Piedmont 60 Broad Street, LLC (f/k/a Wells 60 Broad Street, LLC)	Delaware
Piedmont-800 Nicollett Avenue, LLC (f/k/a Wells REIT-800 Nicollett Avenue, LLC)	Delaware
Piedmont-800 Nicollett Avenue Owner, LLC (f/k/a Wells REIT-800 Nicollett Avenue Owner, LLC)	Delaware
Piedmont-800 Nicollett Avenue Springing Member, LLC (f/k/a Wells REIT-800 Nicollett Avenue Springing Member, LLC)	Delaware
Piedmont-Chicago Center Owner, LLC (f/k/a Wells REIT-Chicago Center Owner, LLC)	Delaware
Piedmont-Chicago Center, Chicago, LLC (f/k/a Wells REIT-Chicago Center, Chicago, LLC)	Delaware
Piedmont-Holtsville, NY, LLC (f/k/a Wells REIT-Holtsville, NY, LLC)	Georgia
800 North Brand Glendale, GA, LLC (f/k/a Wells REIT Glendale, CA, LLC)	Delaware
Piedmont-1430 Enclave Parkway, L.P. (f/k/a Wells REIT-1430 Enclave Parkway, L.P.)	Delaware
Piedmont-1430 Enclave Parkway, GP, LLC (f/k/a Wells REIT-1430 Enclave Parkway, LLC)	Delaware
Enclave Parkway Development, LLC	Delaware
Enclave Parkway Development, L.P.	Delaware
Piedmont-Windy Point I, LLC (f/k/a Wells REIT-Windy Point I, LLC)	Delaware
Piedmont-Windy Point II, LLC (f/k/a Wells REIT-Windy Point II, LLC)	Delaware
Piedmont-2300 Cabot Drive, LLC (f/k/a Wells REIT-2300 Cabot Drive, LLC)	Delaware
Rock Spring, L.L.C.	Delaware
Rock Spring II, L.L.C.	Delaware
500 W Monroe Mezz II, LLC	Delaware
500 W Monroe Mezz I-B, LLC	Delaware
500 W Monroe Chicago, LLC	Delaware
150 West Jefferson, LLC	Delaware
Piedmont 500 West Monroe Mezz I, LLC	Delaware
Piedmont 500 West Monroe Fee, LLC	Delaware
Suwanee Gateway One, LLC	Delaware
Meridian Crossings, LLC	Delaware
Dupree Atlanta, LLC	Delaware
Medici Atlanta, LLC	Delaware
Presidential Way Woburn, LLC	Delaware
400 TownPark, LLC	Delaware
Piedmont Office REIT, Inc.	Michigan
Gavitello, Atlanta, LLC	Delaware
Glenridge Highlands III, LLC	Delaware

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statements (Form S-3D No. 333-166858 and Form S-8 No. 333-142448) of Piedmont Office Realty Trust, Inc. and in the related Prospectuses of our reports dated February 27, 2013, with respect to the consolidated financial statements and schedule of Piedmont Office Realty Trust, Inc., and the effectiveness of internal control over financial reporting of Piedmont Office Realty Trust Inc., included in this Annual Report (Form 10-K) for the year ended December 31, 2012.

Atlanta, Georgia

February 27, 2013

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 annual report on Form 10-K 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 officers 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 officers 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: February 27, 2013

By:	/s/ DONALD A. MILLER, CFA
	Donald A. Miller, CFA
	Principal Executive Officer

EX-31.2

EXHIBIT 31.2

PRINCIPAL EXECUTIVE OFFICER CERTIFICATION

PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Robert E. Bowers, certify that:

1. I have reviewed this annual report on Form 10-K 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 officers 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 officers 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: February 27, 2013

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 Annual Report of Piedmont Office Realty Trust, Inc. (the “Registrant”) on Form 10-K for the year ended December 31, 2012, 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.

It is not intended that this statement be deemed to be filed for the purposes of the Securities Exchange Act of 1934.

By:	/s/ DONALD A. MILLER, CFA
	Donald A. Miller, CFA
	Chief Executive Officer
	February 27, 2013

EX-32.2

EXHIBIT 32.2

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 Annual Report of Piedmont Office Realty Trust, Inc. (the “Registrant”) on Form 10-K for the year ended December 31, 2012, 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.

It is not intended that this statement be deemed to be filed for the purposes of the Securities Exchange Act of 1934.

By:	/s/ ROBERT E. BOWERS
	Robert E. Bowers
	Chief Financial Officer
	February 27, 2013

XML

Operating Leases (Tables)

12 Months Ended

Dec. 31, 2012

Leases [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

The future minimum rental income from Piedmont’s investment in real estate assets under non-cancelable operating leases, excluding unconsolidated joint ventures, as of December 31, 2012, is presented below (in thousands):

Years ending December 31:
2013	$	377,746
2014	349,565
2015	346,084
2016	310,798
2017	290,158
Thereafter	1,384,133
Total	$	3,058,484

XML

Commitments and Contingencies (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012 lawsuit property	Dec. 31, 2011	Dec. 31, 2010
Loss Contingencies [Line Items]
Letter of credit renewal period		1 year
Property subject to or available for operating lease, number of units		3
Operating Leases, Future Minimum Payments Due [Abstract]
2013		$ 750,000
2014		750,000
2015		750,000
2016		750,000
2017		750,000
Thereafter		74,119,000
Total		77,869,000
Number of lawsuits as defendant		2
Litigation settlement charge	7,500,000	7,500,000	0	0
Collectibility of Tenant Reimbursements [Member]
Loss Contingencies [Line Items]
Additional expense related to such tenant audits/disputes		200,000	700,000	400,000
Unsecured Debt [Member] | $500 Million Unsecured Line of Credit [Member]
Loss Contingencies [Line Items]
Debt instrument, face amount		500,000,000
Land [Member]
Operating Leases, Future Minimum Payments Due [Abstract]
Ground rent expense		800,000	600,000	600,000
Building [Member]
Operating Leases, Future Minimum Payments Due [Abstract]
Net book value of real estate assets subject to operating ground leases		31,800,000	26,000,000
Letter of Credit One, July 2013 [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding, amount		10,000,000
Letter of Credit Two, July 2013 [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding, amount		9,033,164
Letter of Credit Three, July 2013 [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding, amount		382,556
NonIncremental Capital Expenditures [Member]
Loss Contingencies [Line Items]
Commitment to provide funding to tenants for capital improvements		111,900,000
Incremental Capital Expenditures [Member]
Loss Contingencies [Line Items]
Commitment to provide funding to tenants for capital improvements		$ 63,800,000

XML

Unconsolidated Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Investment [Line Items]
Equity Method Investments	$ 37,226	$ 38,181
Fund XIII And REIT Joint Venture [Member]
Investment [Line Items]
Equity Method Investment, Ownership Percentage	72.00%
Equity Method Investments	18,814	19,180
Fund XII REIT and Joint Venture [Member]
Investment [Line Items]
Equity Method Investment, Ownership Percentage	55.00%
Equity Method Investments	15,813	16,329
Fund Xl Xll and REIT Joint Venture [Member]
Investment [Line Items]
Equity Method Investment, Ownership Percentage	57.00%
Equity Method Investments	$ 2,599	$ 2,672

XML

Stock Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Stock Awards [Member]		Dec. 31, 2011 Stock Awards [Member]		Dec. 31, 2010 Stock Awards [Member]		Dec. 31, 2012 Stock Awards, Granted May 11, 2010 [Member]		May 11, 2010 Stock Awards, Granted May 11, 2010 [Member]		Dec. 31, 2012 Stock Awards 1, Granted May 24, 2010 [Member]	May 24, 2012 Stock Awards 1, Granted May 24, 2010 [Member]	May 24, 2011 Stock Awards 1, Granted May 24, 2010 [Member]	May 24, 2010 Stock Awards 1, Granted May 24, 2010 [Member]		Dec. 31, 2012 Stock Awards 2, Granted May 24, 2010 [Member]	May 24, 2012 Stock Awards 2, Granted May 24, 2010 [Member]	May 24, 2011 Stock Awards 2, Granted May 24, 2010 [Member]	May 24, 2010 Stock Awards 2, Granted May 24, 2010 [Member]		Dec. 31, 2012 Stock Awards, Granted April 5, 2011 [Member]	Apr. 05, 2012 Stock Awards, Granted April 5, 2011 [Member]	Apr. 05, 2011 Stock Awards, Granted April 5, 2011 [Member]		Dec. 31, 2012 Stock Awards 2, Granted April 5, 2011 [Member]		Apr. 05, 2011 Stock Awards 2, Granted April 5, 2011 [Member]		Dec. 31, 2012 Stock Awards 1, Granted April 4 2012 [Member]	Apr. 04, 2012 Stock Awards 1, Granted April 4 2012 [Member]	Apr. 05, 2011 Stock Awards 1, Granted April 4 2012 [Member]		Dec. 31, 2012 Stock Awards 2, Granted April 4 2012 [Member]		Apr. 05, 2011 Stock Awards 2, Granted April 4 2012 [Member]
Rollforward of deferred stock award activity
Unvested Deferred Stock Awards as of January 1, 2012	511,203						5,266	[1]			52,964					17,457					74,496				0	[1]			168,710				0	[1]
Deferred Stock Awards Granted During Fiscal Year 2012	229,135
Adjustment to Estimated Future Grants of Performance Share Awards During the 2012	(159,474)
Deferred Stock Awards Vested During Fiscal Year 2012	(255,258)
Deferred Stock Awards Forfeited During Fiscal Year 2011 (in shares)	(6,713)
Unvested Deferred Stock Awards as of December 31, 2012	318,893		511,203				5,266	[1]			52,964					17,457					74,496				0	[1]			168,710				0	[1]
Total Grant Date Fair Value of Shares Vested During the Year	$ 5,331		$ 5,405		$ 4,789
Share-based Liabilities Paid	$ 798	[2]	$ 851	[2]	$ 0	[2]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at beginning of year	$ 21.67								$ 28.44					$ 18.71					$ 18.71				$ 19.40				$ 18.27				$ 17.49				$ 17.42
Deferred Stock Awards Granted During Fiscal Year 2012, Weighted-Average Grant Date Fair	$ 17.53		$ 19.03		$ 22.54
Adjustment to Estimated Future Grants of Performance Share Awards During the 2012, Weighted-Average Grant Date Fair	$ 23.64
Deferred Stock Awards Vested During Fiscal Year 2012, Weighted-Average Grant Date Fair Value	$ 20.89
Deferred Stock Awards Forfeited During Fiscal Year 2012, Weighted Average Grant Date Fair Value	$ 18.52
Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year	$ 18.41		$ 21.67						$ 28.44					$ 18.71					$ 18.71				$ 19.40				$ 18.27				$ 17.49				$ 17.42
Net Shares Granted									56,875	[3],[4]				161,148	[3]				40,085	[3]			128,986	[3]			0	[3]			209,876	[3]			0	[3]
Grant Date Fair Value	$ 18.41		$ 21.67						$ 28.44					$ 18.71					$ 18.71				$ 19.40				$ 18.27				$ 17.49				$ 17.42
Unvested Shares (in shares)	318,893		511,203				5,266	[1]			52,964					17,457					74,496				0	[1]			168,710				0	[1]
Of the shares granted, % vested												25.00%	25.00%	25.00%			33.33%	33.33%				25.00%	25.00%							25.00%
Of the shares granted, % expected to vest within one year											25.00%					33.33%					25.00%								25.00%
Of the shares granted, % expected to vest in two years																					25.00%								25.00%
Of the shares granted, % expected to vest in three years																													25.00%

[1] Estimated based on Piedmont's cumulative total stockholder return relative to a predetermined peer group's cumulative total stockholder return for the respective performance period as of December 31, 2012. Such estimates are subject to change in future periods based on both Piedmont's and its peers' stock performance and dividends paid.

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

[3] Amounts reflect the total grant, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2012.

[4] Represents shares granted pursuant to the first and second interim performance periods ended December 31, 2010 and 2011, respectively.

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Acquisitions (Details) (UNDEVELOPED LAND PARCELS [Member], USD $) In Millions, unless otherwise specified	Oct. 15, 2012 acre sqft	Jun. 28, 2012 sqft acre
UNDEVELOPED LAND PARCELS [Member]
Business Acquisition [Line Items]
Purchase Price	$ 1.7	$ 2.5
Area of land	3.0	2.01
Area of real estate property	113,000	249,000

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Variable Interest Entities (Tables)

12 Months Ended

Dec. 31, 2012

Variable Interest Entities [Abstract]

Schedule of Variable Interest Entities

A summary of Piedmont’s interests in and consolidation treatment of its VIEs as of December 31, 2012 is as follows, (net carrying amount in millions):

Entity	Piedmont’s % Ownership of Entity		Related Building	Consolidated/ Unconsolidated	Net Carrying Amount as of December 31, 2012			Net Carrying Amount as of December 31, 2011			Primary Beneficiary Considerations
1201 Eye Street NW Associates, LLC	49.5	%	1201 Eye Street	Consolidated	$	(5.7	)	$	(3.4	)	In accordance with the partnership’s governing documents, Piedmont is entitled to 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building.
1225 Eye Street NW Associates, LLC	49.5	%	1225 Eye Street	Consolidated	$	(0.1	)	$	0.6		In accordance with the partnership’s governing documents, Piedmont is entitled to 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building.
Piedmont Multi-State Owner, LLC	100	%	1200 Crown Colony Drive	Consolidated	$	33.2		$	28.0		In accordance with a tenant's lease, if Piedmont sells the property on or before March 2013, then the tenant would be entitled to an equity participation fee; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
Piedmont 500 W. Monroe Fee, LLC	100	%	500 W. Monroe	Consolidated	$	194.0		$	76.9		The Omnibus Agreement with the previous owner includes equity participation rights for the previous owner, if certain financial returns are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
Suwanee Gateway One, LLC	100	%	Suwanee Gateway One	Consolidated	$	7.6		$	7.7		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
Medici Atlanta, LLC	100	%	The Medici	Consolidated	$	13.7		$	13.0		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
400 TownPark, LLC	100	%	400 TownPark	Consolidated	$	23.5		$	23.7		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.

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Earnings Per Share (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Abstract]
Weighted-average common shares – basic (in shares)	170,312,328	172,764,838	170,752,520
Plus incremental weighted-average shares resulting from the assumed conversion of time-vested restricted stock awards (in shares)	129,000	216,000	214,000
Weighted-average common shares – diluted (in shares)	170,441,223	172,980,947	170,967,324

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Quarterly Results (unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results (unaudited)

Quarterly Results (unaudited)

A summary of the unaudited quarterly financial information for the years ended December 31, 2012 and 2011, is presented below (in thousands, except per-share data). The amounts presented may have been restated from previous period presentations due to reclassifications related to discontinued operations (see Note 14 for further detail).

	2012
	First		Second		Third				Fourth
Revenues	$	132,320	$	133,092	$	134,891			$	136,079
Real estate operating income	$	34,542	$	35,624	$	33,947			$	35,665
Income from continuing operations	$	18,272	$	20,212	$	10,905		(1)	$	14,452		(2)
Income from discontinued operations	$	18,959	$	10,499	$	(70	)		$	(10	)
Net income attributable to Piedmont	$	37,227	$	30,708	$	10,831			$	14,438
Basic earnings per share	$	0.22	$	0.18	$	0.06			$	0.09
Diluted earnings per share	$	0.22	$	0.18	$	0.06			$	0.09
Dividends per share	$	0.2000	$	0.2000	$	0.2000			$	0.2000

⁽¹⁾  Includes $7.5 million of litigation settlement expense related to agreements in principle to settle Piedmont's two outstanding class action lawsuits.

⁽²⁾  Includes $5.2 million in net casualty loss due to damage and related expenses incurred as a result of Hurricane Sandy.

	2011
	First		Second		Third		Fourth
Revenues	$	130,216	$	135,176	$	132,478	$	135,623
Real estate operating income	$	39,710	$	35,452	$	36,341	$	32,428
Income from continuing operations	$	29,658	$	17,403	$	20,499	$	17,518
Income from discontinued operations	$	4,313	$	3,628	$	30,531	$	101,506
Net income attributable to Piedmont	$	33,967	$	21,028	$	51,026	$	119,020
Basic earnings per share	$	0.20	$	0.12	$	0.30	$	0.68
Diluted earnings per share	$	0.20	$	0.12	$	0.29	$	0.69
Dividends per share	$	0.3150	$	0.3150	$	0.3150	$	0.3150

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Line of Credit and Notes Payable (Maturities of Long-term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Debt Disclosure [Abstract]
2013	$ 0
2014	575,000
2015	105,000
2016	596,525
2017	140,000
Thereafter	0
Total	$ 1,416,525

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Schedule of Tax Basis Income

Piedmont’s income tax basis net income for the years ended December 31, 2012, 2011, and 2010, is calculated as follows (in thousands):

	2012			2011			2010
GAAP basis financial statement net income	$	93,204		$	225,041		$	120,379
Increase (decrease) in net income resulting from:
Depreciation and amortization expense for financial reporting purposes in excess of amounts for income tax purposes	35,125			47,346			29,892
Rental income accrued for income tax purposes less than amounts for financial reporting purposes	(10,422		)	(9,380		)	(528		)
Net amortization of above/below-market lease intangibles for financial reporting purposes in excess of amounts for income tax purposes	(5,324		)	(6,605		)	(5,573		)
Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes	(7,967		)	(66,410		)	(9,254		)
Taxable income of Piedmont Washington Properties, Inc., in excess of amount for financial reporting purposes	2,662			4,515			5,096
Other expenses for financial reporting purposes in excess of amounts for income tax purposes	14,361			(2,072		)	9,570
Income tax basis net income, prior to dividends paid deduction	$	121,639		$	192,435		$	149,582

Schedule of Characterization Of Dividends To Common Stockholders

For income tax purposes, dividends to common stockholders are characterized as ordinary income, capital gains, or as a return of a stockholder’s invested capital. The composition of Piedmont’s distributions per common share is presented below:

	2012		2011		2010
Ordinary income	73	%	61	%	69	%
Capital gains	16	%	27	%	—
Return of capital	11	%	12	%	31	%
	100	%	100	%	100	%

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Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Stock Based Compensation [Abstract]

Schedule of Nonvested Share Activity

A rollforward of Piedmont's deferred stock award activity for the year ended December 31, 2012 is as follows:

	Unvested Deferred Stock Awards as of January 1, 2012		Deferred Stock Awards Granted During Fiscal Year 2012		Adjustment to Estimated Future Grants of Performance Share Awards During the 2012			Deferred Stock Awards Vested During Fiscal Year 2012			Deferred Stock Awards Forfeited During Fiscal Year 2012			Unvested Deferred Stock Awards as of December 31, 2012
Shares	511,203		229,135		(159,474		)	(255,258		)	(6,713		)	318,893
Weighted-Average Grant Date Fair Value	$	21.67	$	17.53	$	23.64		$	20.89		$	18.52		$	18.41

The following table provides additional information regarding stock award activity during the years ended December 31, 2012, 2011, and 2010 (in thousands except for per share data):

	2012		2011		2010
Weighted-Average Grant Date Fair Value for Shares Granted During the Year	$	17.53	$	19.03	$	22.54
Total Grant Date Fair Value of Shares Vested During the Year	$	5,331	$	5,405	$	4,789
Share-based Liabilities Paid(1)	$	798	$	851	$	—

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

Schedule of Outstanding Employee Deferred Stock Awards

A detail of Piedmont’s outstanding employee deferred stock awards as of December 31, 2012 is as follows:

Date of grant	Type of Award	Net  Shares Granted (1)		Grant Date Fair Value		Vesting Schedule	Unvested Shares as of December 31, 2012
May 11, 2010	2010-2012 Performance Share Program	56,875	(2)	$	28.44	Shares vest immediately upon determination of award in 2013.	5,266	(3)
May 24, 2010	Annual Deferred Stock Award	161,148		$	18.71	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 24, 2011, 2012, and 2013, respectively.	52,964
May 24, 2010	One-Time, Special Deferred Stock Award in Recognition of Piedmont's Initial Public Offering	40,085		$	18.71	Of the shares granted, 33.33% vested or will vest on May 24, 2011, 2012, and 2013, respectively.	17,457
April 5, 2011	Annual Deferred Stock Award	128,986		$	19.40	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 5, 2012, 2013, and 2014, respectively.	74,496
April 5, 2011	2011-2013 Performance Share Program	—		$	18.27	Shares vest immediately upon award in 2014.	—	(3)
April 4, 2012	Annual Deferred Stock Award	209,876		$	17.49	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 4, 2013, 2014, and 2015, respectively.	168,710
April 4, 2012	2012-2014 Performance Share Program	—		$	17.42	Shares vest immediately upon determination of award in 2015.	—	(3)
Total							318,893

⁽¹⁾  Amounts reflect the total grant, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2012.

⁽²⁾  Represents shares granted pursuant to the first and second interim performance periods ended December 31, 2010 and 2011, respectively.

⁽³⁾  Estimated based on Piedmont's cumulative total stockholder return relative to a predetermined peer group's cumulative total stockholder return for the respective performance period as of December 31, 2012. Such estimates are subject to change in future periods based on both Piedmont's and its peers' stock performance and dividends paid.

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Derivative Instruments (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ (3,100,000)
Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	370,000,000
Interest Rate Swap 1 [Member]
Derivative [Line Items]
Notional Amount	125,000,000
Interest Rate Swap 2 [Member]
Derivative [Line Items]
Notional Amount	75,000,000
Interest Rate Swap 3 [Member]
Derivative [Line Items]
Notional Amount	50,000,000
Interest Rate Swap 4 [Member]
Derivative [Line Items]
Notional Amount	50,000,000
Interest Rate Swap 5 [Member]
Derivative [Line Items]
Notional Amount	70,000,000
Derivative, term of contract	134 months
Credit Risk Contract [Member]
Derivative [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	7,400,000
Interest Expense [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Amount of loss recognized in OCI on derivatives	7,656,000	3,064,000	1,529,000
Amount of previously recorded loss reclassified from accumulated OCI into interest expense	(3,033,000)	(1,218,000)	(4,704,000)
Unsecured Debt [Member] | $300 Million Unsecured Term Loan [Member]
Derivative [Line Items]
Debt instrument, face amount	$ 300,000,000

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Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Net income	$ 14,438,000	$ 10,831,000	$ 30,708,000	$ 37,227,000	$ 119,020,000	$ 51,026,000	$ 21,028,000	$ 33,967,000	$ 93,204,000	$ 225,041,000	$ 120,379,000
Depreciation and amortization expense for financial reporting purposes in excess of amounts for income tax purposes									35,125,000	47,346,000	29,892,000
Rental income accrued for income tax purposes less than amounts for financial reporting purposes									(10,422,000)	(9,380,000)	(528,000)
Net amortization of above/below-market lease intangibles for financial reporting purposes in excess of amounts for income tax purposes									(5,324,000)	(6,605,000)	(5,573,000)
Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes									(7,967,000)	(66,410,000)	(9,254,000)
Taxable income of Piedmont Washington Properties, Inc., in excess of amount for financial reporting purposes									2,662,000	4,515,000	5,096,000
Other expenses for financial reporting purposes in excess of amounts for income tax purposes									14,361,000	(2,072,000)	9,570,000
Income tax basis net income, prior to dividends paid deduction									121,639,000	192,435,000	149,582,000
Ordinary income									73.00%	61.00%	69.00%
Capital gains									16.00%	27.00%	0.00%
Return of capital									11.00%	12.00%	31.00%
Common Stock Dividends, Percent									100.00%	100.00%	100.00%
Tax Basis Of Total Assets	4,100,000,000								4,100,000,000
Accrued interest and penalties related to uncertain tax positions	$ 6,700,000				$ 6,700,000				$ 6,700,000	$ 6,700,000

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Tenant Receivables (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Tenant Receivables [Abstract]
Tenant receivables, net of allowance for doubtful accounts of $346 and $631 as of December 31, 2012 and 2011, respectively	$ 25,038	$ 24,722
Cumulative rental revenue recognized on a straight-line basis in excess of cash received in accordance with lease terms	122,299	104,801
Tenant receivables	147,337	129,523
Allowance for Doubtful Accounts Receivable	$ 346	$ 631

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Organization

12 Months Ended

Dec. 31, 2012

Organization [Abstract]

Organization

Organization

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

As of December 31, 2012, Piedmont owned interests in 74 office properties, plus five office buildings owned through unconsolidated joint ventures. Our 74 office properties are located in 17 metropolitan areas across the United States. These office properties comprise 20.5 million square feet of primarily Class A commercial office space, and were 87.5% leased as of December 31, 2012.

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Quarterly Results (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 136,079	$ 134,891	$ 133,092	$ 132,320	$ 135,623	$ 132,478	$ 135,176	$ 130,216	$ 536,382	$ 533,493	$ 523,447
Real estate operating income	35,665	33,947	35,624	34,542	32,428	36,341	35,452	39,710	139,778	143,931	167,170
Income from continuing operations	14,452	10,905	20,212	18,272	17,518	20,499	17,403	29,658	63,841	85,078	106,803
Income from discontinued operations	(10)	(70)	10,499	18,959	101,506	30,531	3,628	4,313	29,378	139,978	13,591
Net income attributable to Piedmont	14,438	10,831	30,708	37,227	119,020	51,026	21,028	33,967	93,204	225,041	120,379
Basic earnings per share	$ 0.09	$ 0.06	$ 0.18	$ 0.22	$ 0.68	$ 0.30	$ 0.12	$ 0.20	$ 0.55	$ 1.30	$ 0.71
Diluted earnings per share	$ 0.09	$ 0.06	$ 0.18	$ 0.22	$ 0.69	$ 0.29	$ 0.12	$ 0.20	$ 0.55	$ 1.30	$ 0.70
Dividends per share	$ 0.200	$ 0.20	$ 0.20	$ 0.20	$ 0.3150	$ 0.3150	$ 0.3150	$ 0.3150	$ 0.80	$ 1.26	$ 1.26
Litigation settlement charge		7,500							7,500	0	0
Net casualty loss	$ (5,200)								$ (5,170)	$ 0	$ 0

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Quarterly Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

A summary of the unaudited quarterly financial information for the years ended December 31, 2012 and 2011, is presented below (in thousands, except per-share data). The amounts presented may have been restated from previous period presentations due to reclassifications related to discontinued operations (see Note 14 for further detail).

	2012
	First		Second		Third				Fourth
Revenues	$	132,320	$	133,092	$	134,891			$	136,079
Real estate operating income	$	34,542	$	35,624	$	33,947			$	35,665
Income from continuing operations	$	18,272	$	20,212	$	10,905		(1)	$	14,452		(2)
Income from discontinued operations	$	18,959	$	10,499	$	(70	)		$	(10	)
Net income attributable to Piedmont	$	37,227	$	30,708	$	10,831			$	14,438
Basic earnings per share	$	0.22	$	0.18	$	0.06			$	0.09
Diluted earnings per share	$	0.22	$	0.18	$	0.06			$	0.09
Dividends per share	$	0.2000	$	0.2000	$	0.2000			$	0.2000

⁽¹⁾  Includes $7.5 million of litigation settlement expense related to agreements in principle to settle Piedmont's two outstanding class action lawsuits.

⁽²⁾  Includes $5.2 million in net casualty loss due to damage and related expenses incurred as a result of Hurricane Sandy.

	2011
	First		Second		Third		Fourth
Revenues	$	130,216	$	135,176	$	132,478	$	135,623
Real estate operating income	$	39,710	$	35,452	$	36,341	$	32,428
Income from continuing operations	$	29,658	$	17,403	$	20,499	$	17,518
Income from discontinued operations	$	4,313	$	3,628	$	30,531	$	101,506
Net income attributable to Piedmont	$	33,967	$	21,028	$	51,026	$	119,020
Basic earnings per share	$	0.20	$	0.12	$	0.30	$	0.68
Diluted earnings per share	$	0.20	$	0.12	$	0.29	$	0.69
Dividends per share	$	0.3150	$	0.3150	$	0.3150	$	0.3150

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Property, Plant and Equipment

Piedmont’s real estate assets are depreciated or amortized using the straight-line method over the following useful lives:

Buildings	40 years
Building improvements	5-25 years
Land improvements	20-25 years
Tenant improvements	Shorter of economic life or lease term
Furniture, fixtures, and equipment	3-5 years
Intangible lease assets	Lease term

Schedule of Finite-Lived Intangible Assets by Major Class

Gross intangible assets and liabilities as of December 31, 2012 and 2011, respectively, are as follows (in thousands):

	December 31, 2012		December 31, 2011
Intangible Lease Assets:
Above-Market In-Place Lease Assets	$	21,468	$	33,707
Absorption Period Costs	$	101,217	$	164,960
Intangible Lease Origination Costs (included in Deferred Lease Costs)	$	116,995	$	146,375
Intangible Lease Liabilities (Below-Market In-Place Leases)	$	81,736	$	113,018

Amortization Of Intangible Lease Costs

For the years ended December 31, 2012, 2011, and 2010, respectively, Piedmont recognized amortization of intangible lease costs as follows (in thousands):

	2012		2011		2010
Amortization expense related to Intangible Lease Origination Costs and Absorption Period Costs	$	36,151	$	48,013	$	34,660
Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues	$	5,678	$	7,065	$	5,788

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Net intangible assets and liabilities as of December 31, 2012 will be amortized as follows (in thousands):

	Intangible Lease Assets						Liabilities
	Above-Market In-place Lease Assets		Absorption Period Costs		Intangible Lease Origination Costs		Below-Market In-place Lease Liabilities
For the year ending December 31:
2013	$	1,772	$	8,292	$	9,606	$	6,192
2014	1,581		6,897		8,180		5,280
2015	1,480		6,545		7,543		4,769
2016	1,418		6,152		7,124		4,718
2017	770		5,502		6,820		4,685
Thereafter	324		14,012		19,863		15,161
	$	7,345	$	47,400	$	59,136	$	40,805
Weighted-Average Amortization Period (in years)	5		8		8		8

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Use of Estimates, Policy

Use of Estimates

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

Real Estate Assets, Policy

Real Estate Assets

Real estate assets are stated at cost, as adjusted for any impairment, less accumulated depreciation. Amounts capitalized to real estate assets consist of the cost of acquisition or construction, any tenant improvements or major improvements, and betterments that extend the useful life of the related asset. All repairs and maintenance are expensed as incurred. Additionally, Piedmont capitalizes interest while the development of a real estate asset is in progress; however, no such interest was capitalized during the three years ended December 31, 2012.

Piedmont’s real estate assets are depreciated or amortized using the straight-line method over the following useful lives:

Buildings	40 years
Building improvements	5-25 years
Land improvements	20-25 years
Tenant improvements	Shorter of economic life or lease term
Furniture, fixtures, and equipment	3-5 years
Intangible lease assets	Lease term

Piedmont continually monitors events and changes in circumstances that could indicate that the carrying amounts of the real estate and related intangible assets of both operating properties and properties under construction in which Piedmont has an ownership interest, either directly or through investments in joint ventures, may not be recoverable. When indicators of potential impairment are present for wholly-owned properties, management assesses whether the respective carrying values will be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition for assets held for use, or with the estimated fair values, less costs to sell, for assets held for sale. Piedmont generally considers assets to be held for sale at the point at which a sale contract is executed and earnest money has become non-refundable. In the event that the expected undiscounted future cash flows for assets held for use or the estimated fair value, less costs to sell, for assets held for sale do not exceed the respective asset carrying value, management adjusts such assets to the respective estimated fair values and recognizes an impairment loss. Estimated fair values are calculated based on the following information, depending upon availability, in order of preference: (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of undiscounted cash flows, including estimated sales value (which is based on key assumptions such as estimated market rents, lease-up periods, estimated lease terms, and capitalization and discount rates).

For properties owned as part of an investment in unconsolidated joint ventures, Piedmont assesses the fair value of its investment as compared to its carrying amount. If Piedmont determines that the carrying value is greater than the fair value at any measurement date, Piedmont must also determine if such a difference is temporary in nature. Value fluctuations which are “other than temporary” in nature are then recorded to adjust the carrying value to the fair value amount.

Business Combinations Policy

Allocation of Purchase Price of Acquired Assets

Upon the acquisition of real properties, Piedmont allocates the purchase price of properties to acquired tangible assets, consisting of land and building, and identified intangible assets and liabilities, consisting of the value of above-market and below-market leases and the value of in-place leases, based in each case on their estimated fair values.

The fair values of the tangible assets of an acquired property (which includes land and building) are determined by valuing the property as if it were vacant, and the “as-if-vacant” value is then allocated to land and building based on management’s determination of the relative fair value of these assets. Management determines the as-if-vacant fair value of a property using methods similar to those used by independent appraisers. Factors considered by management in performing these analyses include an estimate of carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases, including leasing commissions and other related costs. In estimating carrying costs, management includes real estate taxes, insurance, and other operating expenses during the expected lease-up periods based on current market conditions.

The fair values of above-market and below-market in-place leases are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) management’s estimate of market rates for the corresponding in-place leases, measured over a period equal to the remaining terms of the leases, taking into consideration the probability of renewals for any below-market leases. The capitalized above-market and below-market lease values are recorded as intangible lease assets or liabilities and amortized as an adjustment to rental revenues over the remaining terms of the respective leases.

The fair values of in-place leases include direct costs associated with obtaining a new tenant, opportunity costs associated with lost rentals that are avoided by acquiring an in-place lease, and tenant relationships. Direct costs associated with obtaining a new tenant include commissions, tenant improvements, and other direct costs and are estimated based on management’s consideration of current market costs to execute a similar lease. These direct lease origination costs are included in deferred lease costs in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases. The value of opportunity costs is calculated using the contractual amounts to be paid pursuant to the in-place leases over a market absorption period for a similar lease. These lease intangibles are included in intangible lease assets in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases.

Investments in Unconsolidated Joint Ventures, Policy

Investments in Unconsolidated Joint Ventures

Although Piedmont is the majority equity participant in certain unconsolidated joint ventures, Piedmont does not have a controlling voting interest in any of the unconsolidated joint ventures. Piedmont does, however, exercise significant influence over those joint ventures. Accordingly, Piedmont’s investments in unconsolidated joint ventures are recorded using the equity method of accounting, whereby original investments are recorded at cost and subsequently adjusted for contributions, distributions, and net income/(loss) attributable to such joint ventures. Pursuant to the terms of the unconsolidated joint venture agreements, all income and distributions are allocated to the joint venture partners in accordance with their respective ownership interests. Distributions of net cash from operations are generally distributed to the joint venture partners on a quarterly basis, and are classified as cash inflows from operating activities, as they are presumed to be returns on Piedmont’s investment in the respective joint venture. Proceeds received as the result of a sale of an asset from an unconsolidated joint venture are considered a return of Piedmont’s investment in the joint venture and classified as cash inflows from investing activities.

Cash and Cash Equivalents, Policy

Cash and Cash Equivalents

Piedmont considers all highly-liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash equivalents include cash and short-term investments. Short-term investments are stated at cost, which approximates fair value, and consist of investments in money market accounts.

Tenant Receivables Net, Policy

Tenant Receivables, net

Tenant receivables are comprised of rental and reimbursement billings due from tenants and the cumulative amount of future adjustments necessary to present rental income on a straight-line basis. Tenant receivables are recorded at the original amount earned, less an allowance for any doubtful accounts, which approximates fair value. Management assesses the collectibility of tenant receivables on an ongoing basis and provides for allowances as such balances, or portions thereof, become uncollectible. Piedmont adjusted the allowance for doubtful accounts by recording (recoveries of)/provisions for bad debts of approximately $0, ($0.4) million, and $0.8 million for the years ended December 31, 2012, 2011, and 2010, respectively, which are included in general and administrative expenses in the accompanying consolidated statements of income.

Due from Unconsolidated Joint Ventures, Policy

Due from Unconsolidated Joint Ventures

Due from unconsolidated joint ventures represents operating distributions due to Piedmont from its investments in unconsolidated joint ventures which have been declared but not received as of period end.

Restricted Cash and Escrows, Policy

Restricted Cash and Escrows

Restricted cash and escrows principally relate to the following types of items:

• escrow accounts held by lenders to pay future real estate taxes, insurance, debt service, and tenant improvements;

• net sales proceeds from property sales held by qualified intermediary for potential Section 1031 exchange;

• earnest money paid in connection with future acquisitions; and

• security and utility deposits paid by tenants per the terms of their respective leases.

Restricted cash and escrows are generally reclassified to other asset or liability accounts upon being used to purchase assets, satisfy obligations, or settle tenant obligations.

Prepaid Expenses and Other Assets, Policy

Prepaid Expenses and Other Assets

Prepaid expenses and other assets are primarily comprised of the following items:

• prepaid property taxes, insurance and operating costs;

• receivables which are unrelated to tenants, for example, insurance proceeds receivable from insurers related to casualty losses; and

• equipment, furniture and fixtures, and tenant improvements for Piedmont’s corporate office space, net of accumulated depreciation.

Prepaid expenses and other assets will be expensed as utilized or reclassified to other asset or equity accounts upon being put into service in future periods. Balances without a future economic benefit are expensed as they are identified.

Goodwill, Policy

Goodwill

Goodwill is the excess of cost of an acquired entity over the amounts specifically assigned to assets acquired and liabilities assumed in purchase accounting for business combinations. Piedmont tests the carrying value of its goodwill for impairment on an annual basis, or on an interim basis if an event occurs or circumstances change that would indicate the carrying amount may be impaired. Such interim circumstances may include, but are not limited to, significant adverse changes in legal factors or in the general business climate, adverse action or assessment by a regulator, unanticipated competition, the loss of key personnel, or persistent declines in an entity’s stock price below carrying value of the entity. In accordance with GAAP, Piedmont has the option, should it choose to do so, to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, Piedmont concludes that the estimated fair value is greater than the carrying amount, then performing a further two-step impairment test is unnecessary. However, if Piedmont chooses to forgo the availability of the qualitative analysis, the test prescribed by authoritative accounting guidance is a two-step test. The first step involves comparing the estimated fair value of the entity to its carrying value, including goodwill. Fair value is determined by adjusting the trading price of the stock for various factors including, but not limited to: (i) liquidity or transferability considerations, (ii) control premiums, and/or (iii) fully distributed premiums, if necessary, multiplied by the common shares outstanding. If such calculated fair value exceeds the carrying value, no further procedures or analysis is required. However, if the carrying value exceeds the calculated fair value, goodwill is potentially impaired and step two of the analysis would be required. Step two of the test involves calculating the implied fair value of goodwill by deducting the fair value of all tangible and intangible net assets of the entity from the entity’s fair value calculated in step one of the test. If the implied value of the goodwill (the remainder left after deducting the fair values of the entity from its calculated overall fair value in step one of the test) is less than the carrying value of goodwill, an impairment loss would be recognized.

Interest Rate Derivatives, Policy

Interest Rate Derivatives

Piedmont periodically enters into interest rate derivative agreements to hedge its exposure to changing interest rates. As required by GAAP, Piedmont records all derivatives on the balance sheet at fair value. Piedmont reassesses the effectiveness of its derivatives designated as cash flow hedges on a regular basis to determine if they continue to be highly effective and also to determine if the forecasted transactions remain highly probable. Currently, Piedmont does not use derivatives for trading or speculative purposes.

The changes in fair value of interest rate swap agreements designated as effective cash flow hedges are recorded in other comprehensive income (“OCI”), and subsequently reclassified to earnings when the hedged transactions occur. Changes in the fair values of derivatives designated as cash flow hedges that do not qualify for hedge accounting treatment, if any, would be recorded as gain/(loss) on interest rate swap in the consolidated statements of income. The fair value of the interest rate derivative agreement is recorded as interest rate derivative asset or as interest rate derivative liability in the accompanying consolidated balance sheets. Amounts received or paid under interest rate derivative agreements are recorded as interest expense in the consolidated income statements as incurred. All of Piedmont's interest rate derivative agreements as of December 31, 2012 are designated as cash flow hedges.

Deferred Costs, Policy

Deferred Financing Costs

Deferred financing costs are comprised of costs incurred in connection with securing financing from third-party lenders and are capitalized and amortized to interest expense on a straight-line basis (which approximates the effective interest rate method) over the terms of the related financing arrangements. Piedmont recognized amortization of deferred financing costs for the years ended December 31, 2012, 2011, and 2010 of approximately $2.6 million, $3.2 million, and $2.6 million, respectively, which is included in interest expense in the accompanying consolidated statements of income.

Deferred Lease Costs

Deferred lease costs are comprised of costs and incentives incurred to acquire operating leases, including intangible lease origination costs and direct payroll costs incurred related to negotiating and executing specific leases, and are capitalized and amortized on a straight-line basis over the terms of the related underlying leases. No such internal leasing costs were capitalized for the years ended December 31, 2012, 2011, or 2010. Amortization of deferred leasing costs is reflected in the accompanying consolidated statements of income as follows.

• Piedmont amortized deferred lease costs of approximately $29.8 million, $30.0 million, and $26.8 million for the years ended December 31, 2012, 2011, and 2010, respectively, of which approximately $1.6 million, $1.3 million, and $0.7 million are related to the amortization of deferred common area maintenance costs which are recorded as property operating costs in the accompanying consolidated statements of income. The remaining amortization of deferred lease costs are recorded as amortization expense.

• Piedmont recognized amortization of lease incentives classified as deferred lease costs of $2.5 million, $3.7 million, and $3.4 million, which was recorded as an adjustment to rental income for the years ended December 31, 2012, 2011, and 2010, respectively.

Upon receiving notification of a tenant’s intention to terminate a lease, unamortized deferred lease costs are adjusted to net realizable value through the consolidated statement of income.

Line of Credit and Notes Payable, Policy

Line of Credit and Notes Payable

Certain mortgage notes included in line of credit and notes payable in the accompanying consolidated balance sheets were assumed upon the acquisition of real properties. When debt is assumed, Piedmont adjusts the loan to fair value with a corresponding adjustment to building. The fair value adjustment is amortized to interest expense over the term of the loan using the effective interest method. Amortization of such fair value adjustments was approximately $0, $1.4 million, and $0 for the years ended December 31, 2012, 2011, and 2010, respectively.

Deferred Income, Policy

Deferred income

Deferred income is primarily comprised of the following items:

• prepaid rent from tenants; and

• tenant reimbursements related to operating expense or property tax expenses which may be due to tenants as part of an annual operating expense reconciliation.

Deferred income related to prepaid rents from tenants will be recognized as income in the period it is earned. Amounts related to operating expense reconciliations or property tax expense are relieved when the tenant's reconciliation is completed in accordance with the underlying lease, and payment is issued to the tenant.

Stockholders' Equity, Policy

Shares-in-trust

To date, Piedmont has not issued any shares-in-trust; however, under Piedmont’s charter, it has authority to issue a total of 150,000,000 shares-in-trust, which would be issued only in the event that there is a purported transfer of, or other change in or affecting the ownership of, Piedmont’s capital stock that would result in a violation of the ownership limits that are included in Piedmont’s charter to protect its REIT status.

Preferred Stock

To date, Piedmont has not issued any shares of preferred stock; however, Piedmont is authorized to issue up to 100,000,000 shares of one or more classes or series of preferred stock. Piedmont’s board of directors may determine the relative rights, preferences, and privileges of any class or series of preferred stock that may be issued, and can be more beneficial than the rights, preferences, and privileges attributable to Piedmont’s common stock.

Common Stock

Under Piedmont’s charter, it has authority to issue a total of 750,000,000 shares of common stock with a par value of $0.01 per share. Each share of common stock is entitled to one vote and participates in distributions equally. The board of directors of Piedmont authorized the repurchase and retirement of up to $300 million of Piedmont's common stock through November 2013. Piedmont may repurchase the shares from time to time, in accordance with applicable securities laws, in the open market or in privately negotiated transactions. Repurchases will depend upon market conditions and other factors, and repurchases may be commenced or suspended from time to time in Piedmont's discretion, without prior notice. As of December 31, 2012, approximately $208.0 million is available for share repurchases through November 2013.

Dividends

As a REIT, Piedmont is required by the Internal Revenue Code of 1986, as amended (the “Code”), to make distributions to stockholders each taxable year equal to at least 90% of its taxable income, computed without regard to the dividends-paid deduction and by excluding net capital gains attributable to stockholders (“REIT taxable income”). Piedmont sponsors a dividend reinvestment plan ("DRP") pursuant to which common stockholders may elect (if their brokerage agreements allow) to reinvest an amount equal to the dividends declared on their common shares into additional shares of Piedmont’s common stock in lieu of receiving cash dividends. Under the DRP, Piedmont has the option to either issue shares purchased in the open market or issue shares directly from Piedmont's authorized but unissued shares, in both cases at a 2% discount for the stockholder. Such election takes place at the settlement of each quarterly dividend in which there are participants in the DRP, and may change from quarter to quarter based on management's judgment of the best use of proceeds for Piedmont.

Noncontrolling Interest, Policy

Noncontrolling Interest

Noncontrolling interest represents the equity interests of consolidated entities that are not owned by Piedmont. Noncontrolling interest is adjusted for contributions, distributions, and earnings (loss) attributable to the noncontrolling interest partners of the consolidated joint ventures. All earnings and distributions are allocated to the partners of the consolidated joint ventures in accordance with their respective partnership agreements. Earnings allocated to such noncontrolling interest partners are recorded as income attributable to noncontrolling interest in the accompanying consolidated statements of income.

Revenue Recognition, Policy

Revenue Recognition

All leases of real estate assets held by Piedmont are classified as operating leases, and the related base rental income is generally recognized on a straight-line basis over the terms of the respective leases. Tenant reimbursements are recognized as revenue in the period that the related operating cost is incurred. Rents and tenant reimbursements collected in advance are recorded as deferred income in the accompanying consolidated balance sheets. Other rental income, consisting primarily of lease termination fees, is recognized once Piedmont has satisfied all obligations under the related lease or lease termination agreement.

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

Stock-based Compensation, Policy

Stock-based Compensation

Piedmont has issued stock-based compensation in the form of restricted stock to its employees and directors. For employees, such compensation has been issued pursuant to Piedmont's Long-term Incentive Compensation ("LTIC") program. The LTIC program is comprised of an annual restricted stock grant component and a multi-year performance share component. Awards granted pursuant to the annual restricted stock component are considered equity awards and expensed straight-line over the vesting period, with issuances recorded as a reduction to additional paid in capital. Awards granted pursuant to the performance share component are considered liability awards and are expensed over the service period, with issuances recorded as a reduction to accrued expense. The compensation expense recognized related to both of these award types is recorded as property operating costs for those employees whose job is related to property operation and as general and administrative expense for all other employees and directors in the accompanying consolidated statements of income.

Legal Fees, Policy

Legal Fees and Related Insurance Recoveries

Piedmont recognizes legal expenses in the period in which services are rendered as a component of general and administrative expense or as property operating costs for legal expenses attributable to operating properties. Insurance reimbursements related to ongoing legal matters are recorded as a reduction of legal expense in the period that the insurance company definitively notifies Piedmont of its intent to issue payment.

Litigation Settlement Expense and Related Insurance Recoveries

During the year ended December 31, 2012, Piedmont reached an agreement in principle to settle two separate securities class action lawsuits (See Note 10). As a result of the agreements to settle, Piedmont recorded a $7.5 million charge representing the total of both proposed settlements in its statements of income for the year ended December 31, 2012. Any future insurance recoveries related to these agreements, if applicable, will be recognized as income in the period that the insurance company definitively notifies Piedmont of its intent to issue payment.

Net Casualty Loss/(Gain), Policy

Net Casualty Loss/(Gain)

From time to time, certain of our assets may be damaged or destroyed by natural disasters. Such damages may result in significant expenses related to the destruction of fixed assets or costs to clean, repair, and establish emergency operations at the building or buildings affected by the casualty event. In addition, Piedmont may recognize expenses as a result of issuing rent abatements to tenants for business interruptions caused by the tenants' inability to access the space that they lease from Piedmont. Losses related to the above items are estimated and recorded in the period incurred without regard to whether the loss may be ultimately recoverable under Piedmont's various insurance policies. Any insurance recoveries related to such losses, if applicable, are recorded as income in the period receipt is deemed probable. Insurance recoveries in excess of losses recognized or related to business interruption are recorded as income in the period that the insurance company definitively notifies Piedmont of its intent to issue payment. Casualty losses are presented net of insurance recovery income recorded during the period.

Net Income Available to Common Stockholders Per Share, Policy

Net Income Available to Common Stockholders Per Share

Net income per share-basic is calculated as net income available to common stockholders divided by the weighted average number of common shares outstanding during the period. Net income per share-diluted is calculated as net income available to common stockholders divided by the diluted weighted average number of common shares outstanding during the period, including the dilutive effect of nonvested restricted stock. The dilutive effect of nonvested restricted stock is calculated using the treasury stock method to determine the number of additional common shares that would become outstanding if the remaining unvested restricted stock awards vested. Outstanding stock options have been excluded from the diluted earnings per share calculation, as their impact would be anti-dilutive.

Income Tax, Policy

Income Taxes

Piedmont has elected to be taxed as a REIT under the Code, and has operated as such, beginning with its taxable year ended December 31, 1998. To qualify as a REIT, Piedmont must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its annual REIT taxable income. As a REIT, Piedmont is generally not subject to federal income taxes. Accordingly, neither a provision nor a benefit for federal income taxes has been made in the accompanying consolidated financial statements. Piedmont is subject to certain state and local taxes related to the operations of properties in certain locations, which have been provided for in the financial statements. Additionally, Piedmont conducts certain operations through its taxable REIT subsidiary, Piedmont Office Holdings, Inc. These operations resulted in estimated tax payments of approximately $8.5 thousand for the year ended December 31, 2012, which is recorded in the accompanying financial statements as general and administrative costs.

Reclassifications, Policy

Reclassifications

Certain prior period amounts have been reclassified to conform to the current period financial statement presentation. The reclassifications relate to the required presentation of income from discontinued operations for the properties sold during the years ended December 31, 2012, 2011, and 2010. Please refer to Note 14 for further details. All such reclassifications do not affect net income attributable to Piedmont as presented in previous years

Recent Accounting Pronouncements, Policy

Recent Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board issued Accounting Standards Update 2013-02, Comprehensive Income Topic Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income ("ASU 2013-02"). ASU 2013-02 requires an entity to disclose information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to disclose significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income if the amount reclassified to net income in its entirety in the same reporting period is required under GAAP. For amounts that are not required under GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under GAAP that provide additional detail about those amounts. ASU 2013-02 is effective for Piedmont for the interim period beginning January 1, 2013. The adoption of ASU 2013-02 is not expected to have a material impact on Piedmont's financial statements or disclosures.

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Stock Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense and directors' fees related to stock awards	$ 3.9	$ 6.5	$ 5.1
Compensation expense, non-vested awards	2.5	5.3	3.7
Shares were issued to employees, directors and officers	181,502
Nonvested awards, total compensation cost not yet recognized	$ 2.3
Nonvested awards, total compensation cost not yet recognized, period for recognition	1 year
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Period of predetermined peer group's total stockholder return	3 years

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Organization (Details)	12 Months Ended
	Dec. 31, 2012 subsidiary area
Real Estate Properties [Line Items]
Number Of Wholly Owned Subsidiaries	2
Number of metropolitan areas	17
Unconsolidated Joint Venture [Member]
Real Estate Properties [Line Items]
Number of real estate properties	5
Office properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	74
Area of real estate property	20,500,000
Real Estate Properties Leased, Percent	87.50%

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Tenant Receivables (Tables)

12 Months Ended

Dec. 31, 2012

Tenant Receivables [Abstract]

Schedule Of Tenant Receivables

Tenant receivables as of December 31, 2012 and 2011, respectively, are as follows (in thousands):

	2012		2011
Tenant receivables, net of allowance for doubtful accounts of $346 and $631 as of December 31, 2012 and 2011, respectively	$	25,038	$	24,722
Cumulative rental revenue recognized on a straight-line basis in excess of cash received in accordance with lease terms	122,299		104,801
Tenant receivables	$	147,337	$	129,523

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Unconsolidated Joint Ventures (Tables)

12 Months Ended

Dec. 31, 2012

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Equity Method Investments

As of December 31, 2012 and 2011, Piedmont owned interests in the following unconsolidated joint ventures (in thousands):

Name of Joint Venture	Properties Held by Joint Venture	Piedmont’s Approximate Ownership Percentage		Net Book Value
				2012		2011
Fund XIII and REIT Joint Venture	8560 Upland Drive Two Park Center	72	%	$	18,814	$	19,180
Fund XII REIT and Joint Venture	4685 Investment Drive 5301 Maryland Way	55	%	15,813		16,329
Fund XI, XII and REIT Joint Venture	20/20	57	%	2,599		2,672
				$	37,226	$	38,181

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Flows from Operating Activities:
Net income	$ 93,219	$ 225,056	$ 120,394
Operating distributions received from unconsolidated joint ventures	2,338	2,932	4,463
Adjustments to reconcile net income to net cash provided by operating activities:
Income attributable to noncontrolling interest- discontinued operations	0	453	516
Depreciation	113,649	109,730	104,490
Amortization of deferred financing costs and fair market value adjustments on notes payable	2,648	4,777	2,608
Other amortization	48,840	57,969	43,358
Impairment loss on real estate assets	0	0	7,041
Gain on extinguishment of debt	0	(1,041)	0
Accretion of discount on notes receivable	0	(482)	(2,400)
Stock compensation expense	2,246	4,705	3,681
Reduction of long-lived assets due to casualty event	1,980	0	0
Equity in income of unconsolidated joint ventures	(923)	(1,609)	(2,633)
Gain on consolidation of variable interest entity	0	(1,532)	0
(Gain)/loss on sale of real estate assets	(27,577)	(122,657)	817
Changes in assets and liabilities:
Increase in tenant receivables, net	(21,720)	(13,295)	(5,564)
Decrease/(increase) in restricted cash and escrows	8,705	18,720	(11,818)
Increase in prepaid expenses and other assets	(2,870)	(760)	(1,958)
Increase in accounts payable and accrued expenses	8,486	3,511	12,058
(Decrease)/increase in deferred income	(5,769)	(16,134)	697
Net cash provided by operating activities	223,252	270,343	275,750
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(108,487)	(215,609)	(114,147)
Cash assumed upon consolidation of variable interest entity	0	5,063	0
Net sale proceeds from wholly-owned properties and consolidated joint venture	93,839	291,785	51,637
Net sale proceeds received from unconsolidated joint ventures	0	3,036	189
Investments in unconsolidated joint ventures	(136)	(151)	(173)
Liquidation of noncontrolling interest upon sale of consolidated joint venture	0	(95)	0
Deferred lease costs paid	(51,019)	(50,297)	(17,700)
Net cash (used in)/provided by investing activities	(65,803)	33,732	(80,194)
Cash Flows from Financing Activities:
Deferred financing costs paid	(3,125)	(3,367)	(710)
Proceeds from line of credit and notes payable	409,000	829,000	25,000
Repayments of line of credit and notes payable	(465,000)	(822,875)	(139,000)
Net (costs of)/proceeds from issuance of common stock	(229)	(252)	185,774
Repurchases of common stock as part of announced program	(88,450)	(3,244)	0
Redemptions of common stock	0	0	(2,918)
Dividends paid to stockholders and distributions to noncontrolling interest	(136,378)	(220,365)	(216,988)
Net cash used in financing activities	(284,182)	(221,103)	(148,842)
Net (decrease)/increase in cash and cash equivalents	(126,733)	82,972	46,714
Cash and cash equivalents, beginning of period	139,690	56,718	10,004
Cash and cash equivalents, end of period	$ 12,957	$ 139,690	$ 56,718

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Line of Credit and Notes Payable (Tables)

12 Months Ended

Dec. 31, 2012

Line of Credit and Notes Payable [Abstract]

Schedule of Debt

The following table summarizes the terms of Piedmont’s indebtedness outstanding as of December 31, 2012 and 2011 (in thousands):

Facility	Collateral	Rate(1)			Maturity	Amount Outstanding as of December 31,
						2012		2011
Secured (Fixed)
$45.0 Million Fixed-Rate Loan	4250 N. Fairfax	5.20	%		6/1/2012	$	—	$	45,000
$200.0 Million Mortgage Note	Aon Center	4.87	%		5/1/2014	200,000		200,000
$25.0 Million Mortgage Note	Aon Center	5.70	%		5/1/2014	25,000		25,000
$350.0 Million Secured Pooled Facility	Nine Property Collateralized Pool(2)	4.84	%		6/7/2014	350,000		350,000
$105.0 Million Fixed-Rate Loan	US Bancorp Center	5.29	%		5/11/2015	105,000		105,000
$125.0 Million Fixed-Rate Loan	Four Property Collateralized Pool(3)	5.50	%		4/1/2016	125,000		125,000
$42.5 Million Fixed-Rate Loan	Las Colinas Corporate Center I & II	5.70	%		10/11/2016	42,525		42,525
$140.0 Million WDC Mortgage Notes	1201 & 1225 Eye Street	5.76	%		11/1/2017	140,000		140,000
$140.0 Million 500 W. Monroe Mortgage Loan	500 W. Monroe	LIBOR +  1.008%			8/9/2012	—		140,000
Subtotal/Weighted Average(4)		5.17	%			987,525		1,172,525
Unsecured (Variable)
$300 Million Unsecured Term Loan		LIBOR +  1.45%		(5)	11/22/2016	300,000		300,000
$500 Million Unsecured Line of Credit		1.39	%	(6)	8/19/2016	129,000		—
Subtotal/Weighted Average(4)		2.30	%			429,000		300,000
Total/ Weighted Average(4)		4.30	%			$	1,416,525	$	1,472,525

⁽¹⁾  All of Piedmont’s outstanding debt as of December 31, 2012 and 2011 is interest-only debt.

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

⁽³⁾  Four property collateralized pool includes 1430 Enclave Parkway in Houston, Texas, Windy Point I and II in Schaumburg, Illinois, and 1055 East Colorado Boulevard in Pasadena, California.

⁽⁴⁾  Weighted average is based on contractual balance of outstanding debt and interest rates in the table as of December 31, 2012.

⁽⁵⁾  The $300 Million Unsecured Term Loan has a stated variable rate; however, Piedmont entered into interest rate swap agreements which effectively fix, exclusive of changes to Piedmont's credit rating, the rate on this facility to 2.69% through maturity.

⁽⁶⁾  Piedmont may select from multiple interest rate options with each draw, including the prime rate and various length LIBOR locks. All LIBOR selections are subject to an additional spread (1.175% as of December 31, 2012) over the selected rate based on Piedmont’s current credit rating. The outstanding balance as of December 31, 2012 consists of LIBOR draws at an average rate of 0.22% (subject to the additional spread mentioned above).

Schedule of Maturities of Long-term Debt

A summary of the aggregate maturities of Piedmont’s indebtedness as of December 31, 2012, is provided below (in thousands):

2013	$	—
2014	575,000
2015	105,000
2016	596,525
2017	140,000
Thereafter	—
Total	$	1,416,525

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Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2012

Discontinued Operations [Abstract]

Schedule of Disposal Groups, Including Discontinued Operations, Results Of Operations

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

Building Sold		Location	Date of Sale	Gain/(Loss) on Sale			Net Sales Proceeds
111 Sylvan Avenue	(1)	Englewood Cliffs, New Jersey	December 8, 2010	$	(817	)	$	51,637
Eastpointe Corporate Center		Issaquah, Washington	July 1, 2011	$	12,152		$	31,704
5000 Corporate Court		Holtsville, New York	August 31, 2011	$	14,367		$	36,100
35 West Wacker Drive	(2)	Chicago, Illinois	December 15, 2011	$	96,138		$	223,981
Portland Portfolio	(3)	Beaverton, Oregon	March 19, 2012	$	17,823		$	43,832
26200 Enterprise Way		Lake Forest, California	May 31, 2012	$	10,013		$	24,412
110 & 112 Hidden Lake Circle Buildings		Duncan, South Carolina	September 21, 2012	$	(259	)	$	25,595

⁽¹⁾  Piedmont reclassified the operational results of the property, including a $9.6 million impairment charge that resulted from adjusting the assets to fair value, as discontinued operations in the accompanying 2010 statement of operations. The fair value measurement used in the evaluation of this non-financial asset was considered to be a Level 1 valuation within the fair value hierarchy as defined by GAAP, as there were direct observations and transactions involving the asset (i.e. the asset was sold to a third-party purchaser).

⁽²⁾  Piedmont sold its approximate 96.5% ownership in the property. Transaction data above is presented at Piedmont's ownership percentage.

⁽³⁾  The Portland Portfolio consisted of four office properties known as the Deschutes building, the Rhein building, the Rogue building, and the Willamette building, as well as 18.19 acres of adjoining, undeveloped land.

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures

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

	Years Ended December 31,
	2012		2011			2010
Revenues:
Rental income	$	2,955	$	37,887		$	47,370
Tenant reimbursements	451		19,363			21,105
Lease termination income	—		304			2,761
	3,406		57,554			71,236
Expenses:
Property operating costs	564		21,576			23,305
Depreciation	848		6,926			9,223
Amortization of deferred leasing costs	148		5,517			7,418
General and administrative expenses	45		(170		)	507
	1,605		33,849			40,453
Other income (expense):
Interest expense	—		(5,932		)	(6,274		)
Interest and other income	—		1			2
Net income attributable to noncontrolling interest	—		(453		)	(516		)
	—		(6,384		)	(6,788		)
Operating income, excluding impairment loss and gain/(loss) on sale of real estate assets	1,801		17,321			23,995
Impairment loss	—		—			(9,587		)
Gain/(loss) on sale of real estate assets	27,577		122,657			(817		)
Income from discontinued operations	$	29,378	$	139,978		$	13,591

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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap asset	$ 1,075		$ 0
Interest rate swap liability	8,235		2,537
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	12,957	[1]	139,690	[1]
Tenant receivables, net	147,337	[1]	129,523	[1]
Restricted cash and escrows	334	[1]	9,039	[1]
Accounts payable	23,113	[1]	14,637	[1]
Line of credit and notes payable	1,416,525		1,472,525
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents			139,690	[1]
Tenant receivables, net			129,523	[1]
Restricted cash and escrows			9,039	[1]
Accounts payable			14,637	[1]
Line of credit and notes payable			1,529,811
Interest Rate Swap [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap asset	1,075		0
Interest rate swap liability	8,235		2,537
Interest Rate Swap [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap asset			0
Interest rate swap liability			2,537
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	12,957	[1]
Tenant receivables, net	147,337	[1]
Restricted cash and escrows	334	[1]
Accounts payable	23,113	[1]
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Line of credit and notes payable	1,470,002
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap asset	1,075
Interest rate swap liability	$ 8,235

[1] For the periods presented, the carrying value approximates estimated fair value due to its short-term maturity.

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets:
Land	$ 629,536	$ 640,196
Buildings and improvements, less accumulated depreciation of $883,957 and $792,342 as of December 31, 2012 and December 31, 2011, respectively	2,908,078	2,967,254
Intangible lease assets, less accumulated amortization of $67,940 and $119,419 as of December 31, 2012 and December 31, 2011, respectively	54,745	79,248
Construction in progress	20,373	17,353
Total real estate assets	3,612,732	3,704,051
Investments in unconsolidated joint ventures	37,226	38,181
Cash and cash equivalents	12,957	139,690
Tenant receivables, net of allowance for doubtful accounts of $346 and $631 as of December 31, 2012 and December 31, 2011, respectively	147,337	129,523
Due from unconsolidated joint ventures	463	788
Restricted cash and escrows	334	9,039
Prepaid expenses and other assets	13,022	9,911
Goodwill	180,097	180,097
Interest rate swap	1,075	0
Deferred financing costs, less accumulated amortization of $10,479 and $9,214 as of December 31, 2012 and December 31, 2011, respectively	6,454	5,977
Deferred lease costs, less accumulated amortization of $112,496 and $120,358 as of December 31, 2012 and December 31, 2011, respectively	243,178	230,577
Total assets	4,254,875	4,447,834
Liabilities:
Line of credit and notes payable	1,416,525	1,472,525
Accounts payable, accrued expenses, and accrued capital expenditures	127,263	122,986
Deferred income	21,552	27,321
Intangible lease liabilities, less accumulated amortization of $40,931 and $63,981 as of December 31, 2012 and December 31, 2011, respectively	40,805	49,037
Interest rate swaps	8,235	2,537
Total liabilities	1,614,380	1,674,406
Commitments and Contingencies	0	0
Stockholders' Equity:
Shares-in-trust, 150,000,000 shares authorized, none outstanding as of December 31, 2012 or December 31, 2011	0	0
Preferred stock, no par value, 100,000,000 shares authorized, none outstanding as of December 31, 2012 or December 31, 2011	0	0
Common stock, $.01 par value; 750,000,000 shares authorized, 167,556,001 shares issued and outstanding as of December 31, 2012; and 172,629,748 shares issued and outstanding at December 31, 2011	1,676	1,726
Additional paid-in capital	3,667,051	3,663,662
Cumulative distributions in excess of earnings	(1,022,681)	(891,032)
Other comprehensive loss	(7,160)	(2,537)
Piedmont stockholders’ equity	2,638,886	2,771,819
Noncontrolling interest	1,609	1,609
Total stockholders’ equity	2,640,495	2,773,428
Total liabilities and stockholders’ equity	$ 4,254,875	$ 4,447,834

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Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012 lawsuit joint_venture	Dec. 31, 2011	Dec. 31, 2010
Significant Accounting Policies [Line Items]
Number Of unconsolidated joint venture partnerships		3
Amortization expense related to Intangible Lease Origination Costs and Absorption Period Costs		$ 36,151,000	$ 48,013,000	$ 34,660,000
Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues		5,678,000	7,065,000	5,788,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Total		54,745,000	79,248,000
Recoveries of bad debts			(400,000)
Provision for doubtful accounts		0		800,000
Amortization of deferred financing costs and fair market value adjustments on notes payable		2,600,000	3,200,000	2,600,000
Amortization of deferred lease costs		29,800,000	30,000,000	26,800,000
Amortization of lease incentive		2,500,000	3,700,000	3,400,000
Amortization of debt discount (premium)		0	1,400,000	0
Shares-in-trust, shares authorized		150,000,000	150,000,000
Preferred stock, shares authorized		100,000,000	100,000,000
Common stock, shares authorized		750,000,000	750,000,000
Common stock, par value		$ 0.01	$ 0.01
Stock repurchase program, authorized amount		300,000,000
Stock repurchase program, remaining authorized repurchase amount		208,000,000
Dividend reinvestment plan, shareholders discount		2.00%
Number of lawsuits as defendant		2
Litigation settlement charge	7,500,000	7,500,000	0	0
Minimum [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Real estate investment trust status required taxable income distribution rate		90.00%
Building [Member]
Significant Accounting Policies [Line Items]
Useful life		40 years
Building Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life		5 years
Building Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life		25 years
Land Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life		20 years
Land Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life		25 years
Furniture, fixtures, and equipment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life		3 years
Furniture, fixtures, and equipment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life		5 years
Piedmont Office Holdings, Inc [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Income Tax Expense (Benefit)		8,500
Consolidated Joint Venture [Member]
Significant Accounting Policies [Line Items]
Number of real estate properties		3
Unconsolidated Joint Venture [Member]
Significant Accounting Policies [Line Items]
Number of real estate properties		5
Above-Market In-Place Lease Assets [Member]
Significant Accounting Policies [Line Items]
Intangible Lease Assets		21,468,000		33,707,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2013		1,772,000
2014		1,581,000
2015		1,480,000
2016		1,418,000
2017		770,000
Thereafter		324,000
Total		7,345,000
Weighted-Average Amortization Period (in years)		5 years
Absorption Period Costs [Member]
Significant Accounting Policies [Line Items]
Intangible Lease Assets		101,217,000		164,960,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2013		8,292,000
2014		6,897,000
2015		6,545,000
2016		6,152,000
2017		5,502,000
Thereafter		14,012,000
Total		47,400,000
Weighted-Average Amortization Period (in years)		8 years
Lease Origination Costs [Member]
Significant Accounting Policies [Line Items]
Intangible Lease Assets		116,995,000		146,375,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2013		9,606,000
2014		8,180,000
2015		7,543,000
2016		7,124,000
2017		6,820,000
Thereafter		19,863,000
Total		59,136,000
Weighted-Average Amortization Period (in years)		8 years
Below Market Leases [Member]
Significant Accounting Policies [Line Items]
Intangible Lease Liabilities		81,736,000		113,018,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2013		6,192,000
2014		5,280,000
2015		4,769,000
2016		4,718,000
2017		4,685,000
Thereafter		15,161,000
Total		40,805,000
Weighted-Average Amortization Period (in years)		8 years
Common Area Maintenance Costs [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Amortization of deferred lease costs		$ 1,600,000	$ 1,300,000	$ 700,000

XML

Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Cumulative Distributions in Excess of Earnings [Member]	Redeemable Common Stock [Member]	Other Comprehensive Loss [Member]	Non-controlling Interest [Member]
Balance, value at Dec. 31, 2009	$ 2,606,882	$ 1,589	$ 3,477,168	$ (798,561)	$ (75,164)	$ (3,866)	$ 5,716
Balance (in shares) at Dec. 31, 2009		158,917,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	184,404	138	184,266
Issuance of common stock (in shares)		13,800,000
Redemptions of common stock	(2,902)	(2)	(2,900)
Redemptions of common stock (in shares)		(200,000)
Change in redeemable common stock outstanding	75,164				75,164
Dividends, distributions to noncontrolling interest, and dividends reinvested	(216,988)		(33)	(216,940)			(15)
Shares issued under the 2007 Omnibus Incentive Plan, net of tax, value	2,809	2	2,807
Shares issued under the 2007 Omnibus Incentive Plan, net of tax, shares		141,000
Net income attributable to noncontrolling interest	531						531
Net income	120,379			120,379
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	3,175					3,175
Balance, value at Dec. 31, 2010	2,773,454	1,727	3,661,308	(895,122)	0	(691)	6,232
Balance, (in shares) at Dec. 31, 2010		172,658,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, distributions to noncontrolling interest, and dividends reinvested	(220,365)		(249)	(217,709)			(2,407)
Shares issued under the 2007 Omnibus Incentive Plan, net of tax, value	3,083	1	3,082
Shares issued under the 2007 Omnibus Incentive Plan, net of tax, shares		171,000
Stock repurchases as part of announced program	(3,244)	(2)		(3,242)
Stock repurchases as part of announced program (in shares)		(199,000)
Offering costs associated with issuance of common stock	(479)		(479)
Attribution of asset sales proceeds to noncontrolling interest	(2,684)						(2,684)
Net income attributable to noncontrolling interest	468						468
Net income	225,041			225,041
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1,846)					(1,846)
Balance, value at Dec. 31, 2011	2,773,428	1,726	3,663,662	(891,032)	0	(2,537)	1,609
Balance, (in shares) at Dec. 31, 2011	172,629,748	172,630,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, distributions to noncontrolling interest, and dividends reinvested	(136,378)		(195)	(136,168)			(15)
Shares issued under the 2007 Omnibus Incentive Plan, net of tax, value	3,019	2	3,017
Shares issued under the 2007 Omnibus Incentive Plan, net of tax, shares	181,502	181,000
Stock repurchases as part of announced program	(88,737)	(52)		(88,685)
Stock repurchases as part of announced program (in shares)		(5,255,000)
Offering costs associated with issuance of common stock	567		567
Net income attributable to noncontrolling interest	15						15
Net income	93,204			93,204
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(4,623)					(4,623)
Balance, value at Dec. 31, 2012	$ 2,640,495	$ 1,676	$ 3,667,051	$ (1,022,681)	$ 0	$ (7,160)	$ 1,609
Balance, (in shares) at Dec. 31, 2012	167,556,001	167,556,000

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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended			0 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 08, 2010 Sylvan Avenue 111 Building [Member]		Jul. 02, 2011 Eastpointe Corporate Center [Member]	Aug. 31, 2011 Corporate Court 5000 [Member]	Dec. 15, 2011 W Wacker Building 35 [Member]		Mar. 19, 2012 Portland Portfolio [Member] acre property		May 31, 2012 26200 Enterprise Way [Member]	Sep. 21, 2012 Hidden Lake Circle Buildings [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(loss) on sale of real estate assets									$ 27,577	$ 122,657	$ (817)	$ (817)	[1]	$ 12,152	$ 14,367	$ 96,138	[2]	$ 17,823	[3]	$ 10,013	$ (259)
Net Sales Proceeds									93,839	291,785	51,637	51,637	[1]	31,704	36,100	223,981	[2]	43,832	[3]	24,412	25,595
Impairment loss									0	0	(9,587)
Percent of ownership interest In real estate property disposal																96.50%
Number of real estate properties sold																		4
Area of land																		18.19
Revenues:
Rental income									2,955	37,887	47,370
Tenant reimbursements									451	19,363	21,105
Lease termination income									0	304	2,761
Revenue									3,406	57,554	71,236
Expenses:
Property operating costs									564	21,576	23,305
Depreciation									848	6,926	9,223
Amortization of deferred leasing costs									148	5,517	7,418
General and administrative expenses									45	(170)	507
Expenses									1,605	33,849	40,453
Other income (expense):
Interest expense									0	(5,932)	(6,274)
Interest and other income									0	1	2
Net income attributable to noncontrolling interest									0	(453)	(516)
Other income (expense)									0	(6,384)	(6,788)
Operating income, excluding impairment loss and gain/(loss) on sale of real estate assets									1,801	17,321	23,995
Income from discontinued operations	$ (10)	$ (70)	$ 10,499	$ 18,959	$ 101,506	$ 30,531	$ 3,628	$ 4,313	$ 29,378	$ 139,978	$ 13,591

[1] Piedmont reclassified the operational results of the property, including a $9.6 million impairment charge that resulted from adjusting the assets to fair value, as discontinued operations in the accompanying 2010 statement of operations. The fair value measurement used in the evaluation of this non-financial asset was considered to be a Level 1 valuation within the fair value hierarchy as defined by GAAP, as there were direct observations and transactions involving the asset (i.e. the asset was sold to a third-party purchaser).

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

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

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Measurement of Financial Instruments [Abstract]

Fair Value, by Balance Sheet Grouping

The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments as of December 31, 2012 and 2011, respectively (in thousands):

	2012					2011
Financial Instrument	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy	Carrying Value		Estimated Fair Value
Assets:
Cash and cash equivalents(1)	$	12,957	$	12,957	Level 1	$	139,690	$	139,690
Tenant and notes receivables, net(1)	$	147,337	$	147,337	Level 1	$	129,523	$	129,523
Restricted cash and escrows(1)	$	334	$	334	Level 1	$	9,039	$	9,039
Interest rate swap asset	$	1,075	$	1,075	Level 2	$	—	$	—
Liabilities:
Accounts payable and accrued expenses(1)	$	23,113	$	23,113	Level 1	$	14,637	$	14,637
Interest rate swap liability	$	8,235	$	8,235	Level 2	$	2,537	$	2,537
Line of credit and notes payable	$	1,416,525	$	1,470,002	Level 2	$	1,472,525	$	1,529,811

⁽¹⁾  For the periods presented, the carrying value approximates estimated fair value due to its short-term maturity.

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Discontinued Operations

12 Months Ended

Dec. 31, 2012

Discontinued Operations [Abstract]

Discontinued Operations

Discontinued Operations

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

Building Sold		Location	Date of Sale	Gain/(Loss) on Sale			Net Sales Proceeds
111 Sylvan Avenue	(1)	Englewood Cliffs, New Jersey	December 8, 2010	$	(817	)	$	51,637
Eastpointe Corporate Center		Issaquah, Washington	July 1, 2011	$	12,152		$	31,704
5000 Corporate Court		Holtsville, New York	August 31, 2011	$	14,367		$	36,100
35 West Wacker Drive	(2)	Chicago, Illinois	December 15, 2011	$	96,138		$	223,981
Portland Portfolio	(3)	Beaverton, Oregon	March 19, 2012	$	17,823		$	43,832
26200 Enterprise Way		Lake Forest, California	May 31, 2012	$	10,013		$	24,412
110 & 112 Hidden Lake Circle Buildings		Duncan, South Carolina	September 21, 2012	$	(259	)	$	25,595

⁽¹⁾  Piedmont reclassified the operational results of the property, including a $9.6 million impairment charge that resulted from adjusting the assets to fair value, as discontinued operations in the accompanying 2010 statement of operations. The fair value measurement used in the evaluation of this non-financial asset was considered to be a Level 1 valuation within the fair value hierarchy as defined by GAAP, as there were direct observations and transactions involving the asset (i.e. the asset was sold to a third-party purchaser).

⁽²⁾  Piedmont sold its approximate 96.5% ownership in the property. Transaction data above is presented at Piedmont's ownership percentage.

⁽³⁾  The Portland Portfolio consisted of four office properties known as the Deschutes building, the Rhein building, the Rogue building, and the Willamette building, as well as 18.19 acres of adjoining, undeveloped land.

Income from Discontinued Operations

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

	Years Ended December 31,
	2012		2011			2010
Revenues:
Rental income	$	2,955	$	37,887		$	47,370
Tenant reimbursements	451		19,363			21,105
Lease termination income	—		304			2,761
	3,406		57,554			71,236
Expenses:
Property operating costs	564		21,576			23,305
Depreciation	848		6,926			9,223
Amortization of deferred leasing costs	148		5,517			7,418
General and administrative expenses	45		(170		)	507
	1,605		33,849			40,453
Other income (expense):
Interest expense	—		(5,932		)	(6,274		)
Interest and other income	—		1			2
Net income attributable to noncontrolling interest	—		(453		)	(516		)
	—		(6,384		)	(6,788		)
Operating income, excluding impairment loss and gain/(loss) on sale of real estate assets	1,801		17,321			23,995
Impairment loss	—		—			(9,587		)
Gain/(loss) on sale of real estate assets	27,577		122,657			(817		)
Income from discontinued operations	$	29,378	$	139,978		$	13,591

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Schedule of Letters of Credit

As of December 31, 2012, Piedmont was subject to the following letters of credit, which reduce the total outstanding capacity under its $500 Million Unsecured Line of Credit:

Amount		Expiration of Letter of Credit (1)
$	10,000,000	July 2013
$	9,033,164	July 2013
$	382,556	July 2013

⁽¹⁾  These letter of credit agreements contain an “evergreen” clause, which automatically renews for consecutive, one-year periods each anniversary, subject to certain limitations.

Schedule of Future Minimum Rental Payments for Operating Leases

The aggregate remaining payments required under the terms of these operating leases as of December 31, 2012 are presented below (in thousands):

2013	$	750
2014	750
2015	750
2016	750
2017	750
Thereafter	74,119
Total	$	77,869

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Income Taxes

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Piedmont’s income tax basis net income for the years ended December 31, 2012, 2011, and 2010, is calculated as follows (in thousands):

	2012			2011			2010
GAAP basis financial statement net income	$	93,204		$	225,041		$	120,379
Increase (decrease) in net income resulting from:
Depreciation and amortization expense for financial reporting purposes in excess of amounts for income tax purposes	35,125			47,346			29,892
Rental income accrued for income tax purposes less than amounts for financial reporting purposes	(10,422		)	(9,380		)	(528		)
Net amortization of above/below-market lease intangibles for financial reporting purposes in excess of amounts for income tax purposes	(5,324		)	(6,605		)	(5,573		)
Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes	(7,967		)	(66,410		)	(9,254		)
Taxable income of Piedmont Washington Properties, Inc., in excess of amount for financial reporting purposes	2,662			4,515			5,096
Other expenses for financial reporting purposes in excess of amounts for income tax purposes	14,361			(2,072		)	9,570
Income tax basis net income, prior to dividends paid deduction	$	121,639		$	192,435		$	149,582

For income tax purposes, dividends to common stockholders are characterized as ordinary income, capital gains, or as a return of a stockholder’s invested capital. The composition of Piedmont’s distributions per common share is presented below:

	2012		2011		2010
Ordinary income	73	%	61	%	69	%
Capital gains	16	%	27	%	—
Return of capital	11	%	12	%	31	%
	100	%	100	%	100	%

At December 31, 2012, the tax basis carrying value of Piedmont’s total assets was approximately $4.1 billion.

Accrued interest and penalties related to uncertain tax positions are included in accounts payable, accrued expenses, and accrued capital expenditures in the accompanying consolidated balance sheets and represented approximately $6.7 million as of December 31, 2012 and 2011. Piedmont recorded no additional expense during the years ended December 31, 2012, 2011, and 2010, respectively, related to such positions. The tax years 2009 to 2012 remain open to examination by various federal and state taxing authorities.

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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Stockholders' Equity [Abstract]
Dividends to common stockholders per share	$ 0.200	$ 0.20	$ 0.20	$ 0.20	$ 0.3150	$ 0.3150	$ 0.3150	$ 0.3150	$ 0.80	$ 1.26	$ 1.26

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets:
Intangible lease assets, accumulated amortization	$ 67,940	$ 119,419
Tenant receivables, allowance for doubtful accounts	346	631
Deferred financing costs, accumulated amortization	10,479	9,214
Deferred lease costs, accumulated amortization	112,496	120,358
Liabilities:
Intangible Lease Liabilities Accumulated Amortization	40,931	63,981
Stockholders' Equity:
Shares-in-trust, shares authorized	150,000,000	150,000,000
Shares-in-trust, shares outstanding	0	0
Preferred stock, par value	$ 0	$ 0
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares outstanding	167,556,001	172,629,748
Building and building improvements [Member]
Assets:
Buildings and improvements, accumulated depreciation	$ 883,957	$ 792,342

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Fair Value Measurements

12 Months Ended

Dec. 31, 2012

Fair Value Measurement of Financial Instruments [Abstract]

Fair Value Measurements

Fair Value Measurements

Piedmont considers its cash, accounts receivable, restricted cash and escrows, accounts payable, interest rate swap agreements, and line of credit and notes payable to meet the definition of financial instruments. The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments as of December 31, 2012 and 2011, respectively (in thousands):

	2012					2011
Financial Instrument	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy	Carrying Value		Estimated Fair Value
Assets:
Cash and cash equivalents(1)	$	12,957	$	12,957	Level 1	$	139,690	$	139,690
Tenant and notes receivables, net(1)	$	147,337	$	147,337	Level 1	$	129,523	$	129,523
Restricted cash and escrows(1)	$	334	$	334	Level 1	$	9,039	$	9,039
Interest rate swap asset	$	1,075	$	1,075	Level 2	$	—	$	—
Liabilities:
Accounts payable and accrued expenses(1)	$	23,113	$	23,113	Level 1	$	14,637	$	14,637
Interest rate swap liability	$	8,235	$	8,235	Level 2	$	2,537	$	2,537
Line of credit and notes payable	$	1,416,525	$	1,470,002	Level 2	$	1,472,525	$	1,529,811

⁽¹⁾  For the periods presented, the carrying value approximates estimated fair value due to its short-term maturity.

Piedmont's line of credit and notes payable were carried at book value as of December 31, 2012 and 2011; however, Piedmont's estimate of their fair value is disclosed in the table above. Piedmont uses widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the debt facilities, including the period to maturity of each instrument, and uses observable market-based inputs for similar debt facilities which have transacted recently in the market. Therefore, the fair values determined are considered to be based on significant other observable inputs (Level 2). Scaling adjustments are made to these inputs to make them applicable to the remaining life of Piedmont's outstanding debt. Piedmont has not changed its valuation technique for estimating the fair value of its line of credit and notes payable.

Piedmont’s interest rate swap agreements discussed in Note 8 above are classified as both “Interest rate swap” assets and liabilities in the accompanying consolidated balance sheets and were carried at fair value as of December 31, 2012 and 2011. The valuation of these derivative instruments was determined using widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the derivatives, including the period to maturity of each instrument, and uses observable market-based inputs, including interest rate curves and implied volatilities. Therefore, the fair values determined are considered to be based on significant other observable inputs (Level 2). In addition, Piedmont considered both its own and the respective counterparties’ risk of nonperformance in determining the fair value of its derivative financial instruments by estimating the current and potential future exposure under the derivative financial instruments that both Piedmont and the counterparties were at risk for as of the valuation date. The credit risk of Piedmont and its counterparties was factored into the calculation of the estimated fair value of the interest rate swaps; however, as of December 31, 2012 and 2011, this credit valuation adjustment did not comprise a material portion of the estimated fair value. Therefore, Piedmont believes that any unobservable inputs used to determine the fair values of its derivative financial instruments are not significant to the fair value measurements in their entirety, and does not consider any of its derivative financial instruments to be Level 3 liabilities.

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Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2012	Feb. 26, 2013	Jun. 29, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	Piedmont Office Realty Trust, Inc.
Entity Central Index Key	0001042776
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		167,555,401
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2,916,495,257

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Commitments Under Existing Lease Agreements

Certain lease agreements include provisions that, at the option of the tenant, may obligate Piedmont to provide funding for capital improvements. Under its existing lease agreements, Piedmont may be required to fund significant tenant improvements, leasing commissions, and building improvements. In addition, certain agreements contain provisions that require Piedmont to issue corporate or property guarantees to provide funding for capital improvements or other financial obligations. Further, Piedmont classifies such tenant and building improvements into two classes: (i) improvements which incrementally enhance the building's asset value by expanding its revenue generating capacity (“incremental capital expenditures”) and (ii) improvements which maintain the building's existing asset value and its revenue generating capacity (“non-incremental capital expenditures”). As of December 31, 2012, Piedmont anticipates funding potential non-incremental capital expenditures for tenant improvements of approximately $111.9 million related to its existing lease portfolio over the respective lease terms, the majority of which Piedmont estimates may

be required to be funded over the next several years. For most of Piedmont’s leases, the timing of the actual funding of these tenant improvements is largely dependent upon tenant requests for reimbursement. In some cases, these obligations may expire with the leases without further recourse to Piedmont.

Additionally, as of December 31, 2012, commitments for incremental capital expenditures associated with new leases, primarily at value-add properties, totals approximately $63.8 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 additional expense related to such tenant audits/disputes of approximately $0.2 million, $0.7 million and $0.4 million during the years ended December 31, 2012, 2011, and 2010, respectively.

Letters of Credit

As of December 31, 2012, Piedmont was subject to the following letters of credit, which reduce the total outstanding capacity under its $500 Million Unsecured Line of Credit:

Amount		Expiration of Letter of Credit (1)
$	10,000,000	July 2013
$	9,033,164	July 2013
$	382,556	July 2013

⁽¹⁾  These letter of credit agreements contain an “evergreen” clause, which automatically renews for consecutive, one-year periods each anniversary, subject to certain limitations.

Operating Lease Obligations

Three properties (the River Corporate Center building in Tempe, Arizona; the 8700 South Price Road building in Tempe, Arizona; and the 2001 NW 64^th Street building in Ft. Lauderdale, Florida) are subject to ground leases with expiration dates ranging between 2048 and 2101. The aggregate remaining payments required under the terms of these operating leases as of December 31, 2012 are presented below (in thousands):

2013	$	750
2014	750
2015	750
2016	750
2017	750
Thereafter	74,119
Total	$	77,869

Ground rent expense was approximately $0.8 million, $0.6 million, and $0.6 million for the years ended December 31, 2012, 2011, and 2010, respectively, and is included in property operating costs in the accompanying consolidated statements of income. The net book value of the real estate assets of the related office buildings subject to operating ground leases is approximately $31.8 million and $26.0 million as of December 31, 2012 and 2011, respectively.

Agreements in Principle to Resolve Legal Actions

Piedmont and certain of its current and former officers and directors were party to two separate securities class action lawsuits which challenged various disclosures made in connection with Piedmont's April 2007 internalization transaction in one case and a response to a May 2007 tender offer for Piedmont's shares and an October 2007 proxy statement seeking approval of amendments to Piedmont's charter in the other case. (Please refer to Part I. Item 3 “Legal Proceedings” for a complete description of the chronology of the two lawsuits). During the year ended December 31, 2012, after receiving favorable rulings including the dismissal of all claims in both cases, Piedmont reached agreement in principle to settle both lawsuits, thus avoiding additional legal expense associated with any further appeals by the plaintiffs. As a result, during the year ended December 31, 2012, Piedmont recorded a $7.5 million litigation settlement charge in the accompanying financial statements (Please see Note 2 - Litigation Settlement Expense). The settlements are subject to court approval following notice to the classes. As such, the possibility of further financial loss does exist; however, management has concluded that such risk of loss is remote.

Other Legal Matters

Piedmont is from time to time a party to legal proceedings, which arise in the ordinary course of its business. None of these ordinary course legal proceedings are reasonably likely to have a material adverse effect on results of operations or financial condition.

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Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Rental income	$ 425,232	$ 412,093	$ 401,163
Tenant reimbursements	107,833	115,082	114,039
Property management fee revenue	2,318	1,584	3,212
Other rental income	999	4,734	5,033
Total revenues	536,382	533,493	523,447
Expenses:
Property operating costs	212,932	207,199	195,368
Depreciation	112,801	102,804	95,267
Amortization	50,105	54,485	37,513
General and administrative	20,766	25,074	28,129
Operating Expenses	396,604	389,562	356,277
Real estate operating income	139,778	143,931	167,170
Other income (expense):
Interest expense	(65,023)	(65,817)	(66,486)
Interest and other income	833	2,774	3,486
Litigation settlement expense	(7,500)	0	0
Net casualty loss	(5,170)	0	0
Equity in income of unconsolidated joint ventures	923	1,619	2,633
Gain on consolidation of variable interest entity	0	1,532	0
Gain on extinguishment of debt	0	1,039	0
Nonoperating Income (Expense)	(75,937)	(58,853)	(60,367)
Income from continuing operations	63,841	85,078	106,803
Discontinued operations:
Operating income, excluding impairment loss	1,801	17,321	23,995
Impairment loss	0	0	(9,587)
Gain/(loss) on sale of real estate assets	27,577	122,657	(817)
Income from discontinued operations	29,378	139,978	13,591
Net income	93,219	225,056	120,394
Less: Net income attributable to noncontrolling interest	(15)	(15)	(15)
Net income attributable to Piedmont	$ 93,204	$ 225,041	$ 120,379
Per share information – basic:
Income from continuing operations (in dollars per share)	$ 0.38	$ 0.49	$ 0.63
Income from discontinued operations (in dollars per share)	$ 0.17	$ 0.81	$ 0.08
Income attributable to noncontrolling interest (in dollars per share)	$ 0.00	$ 0.00	$ 0.00
Net income available to common stockholders (in dollars per share)	$ 0.55	$ 1.30	$ 0.71
Per share information – diluted:
Income from continuing operations (in dollars per share)	$ 0.38	$ 0.49	$ 0.62
Income from discontinued operations (in dollars per share)	$ 0.17	$ 0.81	$ 0.08
Income attributable to noncontrolling interest (in dollars per share)	$ 0.00	$ 0.00	$ 0.00
Net income available to common stockholders (in dollars per share)	$ 0.55	$ 1.30	$ 0.70
Weighted-average common shares outstanding - basic (in shares)	170,312,328	172,764,838	170,752,520
Weighted-average common shares outstanding - diluted (in shares)	170,441,223	172,980,947	170,967,324

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Tenant Receivables

12 Months Ended

Dec. 31, 2012

Tenant Receivables [Abstract]

Tenant Receivables

Tenant Receivables

Tenant receivables as of December 31, 2012 and 2011, respectively, are as follows (in thousands):

	2012		2011
Tenant receivables, net of allowance for doubtful accounts of $346 and $631 as of December 31, 2012 and 2011, respectively	$	25,038	$	24,722
Cumulative rental revenue recognized on a straight-line basis in excess of cash received in accordance with lease terms	122,299		104,801
Tenant receivables	$	147,337	$	129,523

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Acquisitions

12 Months Ended

Dec. 31, 2012

Acquisitions [Abstract]

Acquisitions

Acquisitions

During the year ended December 31, 2012, Piedmont's acquisition activity consisted of purchasing tracts of undeveloped land. On June 28, 2012, Piedmont purchased undeveloped land adjacent to the Medici building in Atlanta, Georgia for a purchase price of approximately $2.5 million. The undeveloped land consists of approximately 2.01 acres, is zoned for office and accessory use, and has a site plan approved for approximately 249,000 square feet.

On October 15, 2012, Piedmont purchased undeveloped land adjacent to the Glenridge Highlands II building in Atlanta, Georgia for a purchase price of approximately $1.7 million. The land consists of approximately 3.0 acres, is zoned for office use, and has a site plan approved for approximately 113,000 square feet.

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Supplemental Disclosures of Noncash Activities

12 Months Ended

Dec. 31, 2012

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosures of Noncash Activities

Supplemental Disclosures of Noncash Activities

Significant noncash investing and financing activities for the years ended December 31, 2012, 2011, and 2010 (in thousands) are outlined below:

	2012			2011		2010
Accrued capital expenditures and deferred lease costs	$	12,598		$	8,218	$	8,047
Change in accrued offering costs related to issuance of common stock	$	(567	)	$	227	$	1,370
Net assets assumed upon consolidation of variable interest entity, net of notes receivable previously recorded	$	—		$	188,283	$	—
Liabilities assumed upon consolidation of variable interest entity	$	—		$	191,814	$	—
Redeemable common stock	$	—		$	—	$	75,164

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Stock Based Compensation

12 Months Ended

Dec. 31, 2012

Stock Based Compensation [Abstract]

Stock Based Compensation

Stock Based Compensation

Deferred Stock Awards

Piedmont has granted deferred stock awards in the form of restricted stock to its employees. The awards are determined by the Compensation Committee of the board of directors of Piedmont on an annual basis and typically vest over a three-year period beginning on the grant date. In addition, Piedmont has adopted a multi-year performance share program for certain of its employees. Restricted shares are earned based on the relative performance of Piedmont's total stockholder return as compared with a predetermined peer group's total stockholder return over a three-year period. Any shares awarded vest immediately upon issuance.

A rollforward of Piedmont's deferred stock award activity for the year ended December 31, 2012 is as follows:

	Unvested Deferred Stock Awards as of January 1, 2012		Deferred Stock Awards Granted During Fiscal Year 2012		Adjustment to Estimated Future Grants of Performance Share Awards During the 2012			Deferred Stock Awards Vested During Fiscal Year 2012			Deferred Stock Awards Forfeited During Fiscal Year 2012			Unvested Deferred Stock Awards as of December 31, 2012
Shares	511,203		229,135		(159,474		)	(255,258		)	(6,713		)	318,893
Weighted-Average Grant Date Fair Value	$	21.67	$	17.53	$	23.64		$	20.89		$	18.52		$	18.41

The following table provides additional information regarding stock award activity during the years ended December 31, 2012, 2011, and 2010 (in thousands except for per share data):

	2012		2011		2010
Weighted-Average Grant Date Fair Value for Shares Granted During the Year	$	17.53	$	19.03	$	22.54
Total Grant Date Fair Value of Shares Vested During the Year	$	5,331	$	5,405	$	4,789
Share-based Liabilities Paid(1)	$	798	$	851	$	—

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

A detail of Piedmont’s outstanding employee deferred stock awards as of December 31, 2012 is as follows:

Date of grant	Type of Award	Net  Shares Granted (1)		Grant Date Fair Value		Vesting Schedule	Unvested Shares as of December 31, 2012
May 11, 2010	2010-2012 Performance Share Program	56,875	(2)	$	28.44	Shares vest immediately upon determination of award in 2013.	5,266	(3)
May 24, 2010	Annual Deferred Stock Award	161,148		$	18.71	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 24, 2011, 2012, and 2013, respectively.	52,964
May 24, 2010	One-Time, Special Deferred Stock Award in Recognition of Piedmont's Initial Public Offering	40,085		$	18.71	Of the shares granted, 33.33% vested or will vest on May 24, 2011, 2012, and 2013, respectively.	17,457
April 5, 2011	Annual Deferred Stock Award	128,986		$	19.40	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 5, 2012, 2013, and 2014, respectively.	74,496
April 5, 2011	2011-2013 Performance Share Program	—		$	18.27	Shares vest immediately upon award in 2014.	—	(3)
April 4, 2012	Annual Deferred Stock Award	209,876		$	17.49	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 4, 2013, 2014, and 2015, respectively.	168,710
April 4, 2012	2012-2014 Performance Share Program	—		$	17.42	Shares vest immediately upon determination of award in 2015.	—	(3)
Total							318,893

⁽¹⁾  Amounts reflect the total grant, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2012.

⁽²⁾  Represents shares granted pursuant to the first and second interim performance periods ended December 31, 2010 and 2011, respectively.

⁽³⁾  Estimated based on Piedmont's cumulative total stockholder return relative to a predetermined peer group's cumulative total stockholder return for the respective performance period as of December 31, 2012. Such estimates are subject to change in future periods based on both Piedmont's and its peers' stock performance and dividends paid.

During the years ended December 31, 2012, 2011, and 2010, Piedmont recognized approximately $3.9 million, $6.5 million and $5.1 million of compensation expense and directors' fees related to stock awards, respectively, of which $2.5 million, $5.3 million and $3.7 million, respectively, related to the non-vested shares. During the year ended December 31, 2012, 181,502 shares were issued to employees, directors and officers. As of December 31, 2012, approximately $2.3 million of unrecognized compensation cost related to non-vested, share-based compensation remained, which Piedmont will record in its statements of income over a weighted-average vesting period of approximately one year.

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Variable Interest Entities

12 Months Ended

Dec. 31, 2012

Variable Interest Entities [Abstract]

Variable Interest Entities

Variable Interest Entities

Variable interest holders who have the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and have the obligation to absorb the majority of losses of the entity or the right to receive significant benefits of the entity are considered to be the primary beneficiary and must consolidate the VIE.

A summary of Piedmont’s interests in and consolidation treatment of its VIEs as of December 31, 2012 is as follows, (net carrying amount in millions):

Entity	Piedmont’s % Ownership of Entity		Related Building	Consolidated/ Unconsolidated	Net Carrying Amount as of December 31, 2012			Net Carrying Amount as of December 31, 2011			Primary Beneficiary Considerations
1201 Eye Street NW Associates, LLC	49.5	%	1201 Eye Street	Consolidated	$	(5.7	)	$	(3.4	)	In accordance with the partnership’s governing documents, Piedmont is entitled to 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building.
1225 Eye Street NW Associates, LLC	49.5	%	1225 Eye Street	Consolidated	$	(0.1	)	$	0.6		In accordance with the partnership’s governing documents, Piedmont is entitled to 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building.
Piedmont Multi-State Owner, LLC	100	%	1200 Crown Colony Drive	Consolidated	$	33.2		$	28.0		In accordance with a tenant's lease, if Piedmont sells the property on or before March 2013, then the tenant would be entitled to an equity participation fee; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
Piedmont 500 W. Monroe Fee, LLC	100	%	500 W. Monroe	Consolidated	$	194.0		$	76.9		The Omnibus Agreement with the previous owner includes equity participation rights for the previous owner, if certain financial returns are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
Suwanee Gateway One, LLC	100	%	Suwanee Gateway One	Consolidated	$	7.6		$	7.7		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
Medici Atlanta, LLC	100	%	The Medici	Consolidated	$	13.7		$	13.0		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
400 TownPark, LLC	100	%	400 TownPark	Consolidated	$	23.5		$	23.7		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.

Each of the VIEs described above has the sole purpose of holding office buildings and their resulting operations, and are classified in the accompanying consolidated balance sheets in the same manner as Piedmont's wholly-owned properties.

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Supplemental Disclosures of Noncash Activities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Cash Flow Elements [Abstract]
Accrued capital expenditures and deferred lease costs	$ 12,598	$ 8,218	$ 8,047
Change in accrued offering costs related to issuance of common stock	(567)	227	1,370
Net assets assumed upon consolidation of variable interest entity, net of notes receivable previously recorded	0	188,283	0
Liabilities assumed upon consolidation of variable interest entity	0	191,814	0
Redeemable common stock	$ 0	$ 0	$ 75,164

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Unconsolidated Joint Ventures

12 Months Ended

Dec. 31, 2012

Equity Method Investments and Joint Ventures [Abstract]

Unconsolidated Joint Ventures

Unconsolidated Joint Ventures

Investments in Unconsolidated Joint Ventures

As of December 31, 2012 and 2011, Piedmont owned interests in the following unconsolidated joint ventures (in thousands):

Name of Joint Venture	Properties Held by Joint Venture	Piedmont’s Approximate Ownership Percentage		Net Book Value
				2012		2011
Fund XIII and REIT Joint Venture	8560 Upland Drive Two Park Center	72	%	$	18,814	$	19,180
Fund XII REIT and Joint Venture	4685 Investment Drive 5301 Maryland Way	55	%	15,813		16,329
Fund XI, XII and REIT Joint Venture	20/20	57	%	2,599		2,672
				$	37,226	$	38,181

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Line of Credit and Notes Payable

12 Months Ended

Dec. 31, 2012

Line of Credit and Notes Payable [Abstract]

Line of Credit and Notes Payable

Line of Credit and Notes Payable

During the year ended December 31, 2012, Piedmont OP entered into a new $500 million unsecured line of credit facility (the “$500 Million Unsecured Line of Credit”) with a consortium of lenders to replace its expiring $500 Million Unsecured Facility. The term of the $500 Million Unsecured Line of Credit is four years with an extended maturity date of August 21, 2017 (assuming Piedmont extends the term for an additional year through two available six month extensions). Additionally, under certain terms of the agreement, Piedmont may increase the new facility by up to an additional $500 million (to an aggregate size of $1.0 billion); however, none of the existing lenders have any obligation to participate in such increase. Piedmont paid customary fees to the lenders in connection with the closing of the new $500 Million Unsecured Line of Credit. The $500 Million Unsecured Line of Credit has the option to bear interest at varying levels based on (i) the London Interbank Offered Rate (“LIBOR”) or 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 one percent, (ii) the credit rating for Piedmont, and (iii) for LIBOR loans, 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. The stated interest rate spread over LIBOR can vary from 1.00% to 1.75% based upon the then current credit rating of Piedmont. As of December 31, 2012, the current stated LIBOR spread on the $500 Million Unsecured Line of Credit was 1.175%, and Piedmont had met all of the financial covenant requirements.

Other Financing Activity

During the year ended December 31, 2012, Piedmont fully repaid its $140 million mortgage which had been secured by the 500 W. Monroe building in Chicago, Illinois, and its $45 million loan which had been secured by the 4250 N. Fairfax building in Arlington, Virginia. Additionally, during the year ended December 31, 2012, Piedmont incurred net borrowings of approximately $129.0 million on its outstanding lines of credit.

The following table summarizes the terms of Piedmont’s indebtedness outstanding as of December 31, 2012 and 2011 (in thousands):

Facility	Collateral	Rate(1)			Maturity	Amount Outstanding as of December 31,
						2012		2011
Secured (Fixed)
$45.0 Million Fixed-Rate Loan	4250 N. Fairfax	5.20	%		6/1/2012	$	—	$	45,000
$200.0 Million Mortgage Note	Aon Center	4.87	%		5/1/2014	200,000		200,000
$25.0 Million Mortgage Note	Aon Center	5.70	%		5/1/2014	25,000		25,000
$350.0 Million Secured Pooled Facility	Nine Property Collateralized Pool(2)	4.84	%		6/7/2014	350,000		350,000
$105.0 Million Fixed-Rate Loan	US Bancorp Center	5.29	%		5/11/2015	105,000		105,000
$125.0 Million Fixed-Rate Loan	Four Property Collateralized Pool(3)	5.50	%		4/1/2016	125,000		125,000
$42.5 Million Fixed-Rate Loan	Las Colinas Corporate Center I & II	5.70	%		10/11/2016	42,525		42,525
$140.0 Million WDC Mortgage Notes	1201 & 1225 Eye Street	5.76	%		11/1/2017	140,000		140,000
$140.0 Million 500 W. Monroe Mortgage Loan	500 W. Monroe	LIBOR +  1.008%			8/9/2012	—		140,000
Subtotal/Weighted Average(4)		5.17	%			987,525		1,172,525
Unsecured (Variable)
$300 Million Unsecured Term Loan		LIBOR +  1.45%		(5)	11/22/2016	300,000		300,000
$500 Million Unsecured Line of Credit		1.39	%	(6)	8/19/2016	129,000		—
Subtotal/Weighted Average(4)		2.30	%			429,000		300,000
Total/ Weighted Average(4)		4.30	%			$	1,416,525	$	1,472,525

⁽¹⁾  All of Piedmont’s outstanding debt as of December 31, 2012 and 2011 is interest-only debt.

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

⁽³⁾  Four property collateralized pool includes 1430 Enclave Parkway in Houston, Texas, Windy Point I and II in Schaumburg, Illinois, and 1055 East Colorado Boulevard in Pasadena, California.

⁽⁴⁾  Weighted average is based on contractual balance of outstanding debt and interest rates in the table as of December 31, 2012.

⁽⁵⁾  The $300 Million Unsecured Term Loan has a stated variable rate; however, Piedmont entered into interest rate swap agreements which effectively fix, exclusive of changes to Piedmont's credit rating, the rate on this facility to 2.69% through maturity.

⁽⁶⁾  Piedmont may select from multiple interest rate options with each draw, including the prime rate and various length LIBOR locks. All LIBOR selections are subject to an additional spread (1.175% as of December 31, 2012) over the selected rate based on Piedmont’s current credit rating. The outstanding balance as of December 31, 2012 consists of LIBOR draws at an average rate of 0.22% (subject to the additional spread mentioned above).

A summary of the aggregate maturities of Piedmont’s indebtedness as of December 31, 2012, is provided below (in thousands):

2013	$	—
2014	575,000
2015	105,000
2016	596,525
2017	140,000
Thereafter	—
Total	$	1,416,525

Piedmont’s weighted-average interest rate as of December 31, 2012 and 2011, for aforementioned borrowings was approximately 4.30% and 4.29%, respectively. Piedmont made interest payments on all indebtedness, including interest rate swap cash settlements, of approximately $62.6 million, $66.7 million, and $70.2 million during the years ended December 31, 2012, 2011, and 2010, respectively.

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Derivative Instruments

12 Months Ended

Dec. 31, 2012

Derivative Instruments [Abstract]

Derivative Instruments

Derivative Instruments

Risk Management Objective of Using Derivatives

In addition to operational risks which arise in the normal course of business, Piedmont is exposed to economic risks such as interest rate, liquidity, and credit risk. In certain situations, Piedmont has entered into derivative financial instruments such as interest rate swap agreements and other similar agreements to manage interest rate risk exposure arising from current or future variable rate debt transactions. Interest rate swap agreements involve the receipt 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. 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

During the year ended December 31, 2012, Piedmont used four interest rate swap agreements to hedge the variable cash flows associated with its $300 Million Unsecured Term Loan. Additionally, during the year ended December 31, 2012, Piedmont entered into a forward starting swap with a total notional value of $70.0 million to hedge the risk of changes in the interest payments associated with the potential issuance of long-term debt over a maximum period of 134 months.

A detail of Piedmont’s interest rate derivatives outstanding as of December 31, 2012 is as follows:

Interest Rate Derivatives:	Notional Amount (in millions)		Effective Date	Maturity Date
Interest rate swap	$	125	11/22/2011	11/22/2016
Interest rate swap	$	75	11/22/2011	11/22/2016
Interest rate swap	$	50	11/22/2011	11/22/2016
Interest rate swap	$	50	11/22/2011	11/22/2016
Interest rate swap	$	70	3/3/2014	3/3/2024
Total	$	370

All of Piedmont's interest rate swap agreements outstanding for the periods presented were designated as cash flow hedges of interest rate risk. As such, the effective portion of the changes in the fair value of these derivatives was recorded in other comprehensive income ("OCI") and subsequently reclassified into the accompanying consolidated statements of income for the years ended December 31, 2012, 2011, and 2010, respectively, as follows (in thousands):

Derivative in Cash Flow Hedging Relationships (Interest Rate Swaps and Caps)	2012			2011			2010
Amount of loss recognized in OCI on derivatives	$	7,656		$	3,064		$	1,529
Amount of previously recorded loss reclassified from accumulated OCI into interest expense	$	(3,033	)	$	(1,218	)	$	(4,704	)

Piedmont estimates that an additional $3.1 million will be reclassified from accumulated other comprehensive loss as an increase to interest expense over the next twelve months. No gain or loss was recognized related to hedge ineffectiveness or to amounts excluded from effectiveness testing on Piedmont’s cash flow hedges during the years ended December 31, 2012, 2011, or 2010.

Additionally, see Note 9 for fair value disclosures of Piedmont's derivative instruments.

Credit-risk-related Contingent Features

Piedmont has agreements with its derivative counterparties that contain a provision whereby if Piedmont defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then Piedmont could also be declared in default on its derivative obligation. If Piedmont breached any of the contractual provisions of the derivative contracts, it would be required to settle its obligations under the agreements at their termination value of the fair values plus accrued interest, or approximately $7.4 million.

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Schedule III - Real Estate Assets and Accumulated Depreciation (Details) (USD $)	12 Months Ended							12 Months Ended						12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended							12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended							12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2012 DALLAS PARKWAY 3900 [Member]	Dec. 31, 2012 DALLAS PARKWAY 3900 [Member] Minimum [Member]		Dec. 31, 2012 DALLAS PARKWAY 3900 [Member] Maximum [Member]		Dec. 31, 2012 RIVER CORPORATE CENTER [Member]		Dec. 31, 2012 RIVER CORPORATE CENTER [Member] Minimum [Member]		Dec. 31, 2012 RIVER CORPORATE CENTER [Member] Maximum [Member]		Dec. 31, 2012 SOUTH PRICE ROAD 8700 [Member]		Dec. 31, 2012 SOUTH PRICE ROAD 8700 [Member] Minimum [Member]		Dec. 31, 2012 SOUTH PRICE ROAD 8700 [Member] Maximum [Member]		Dec. 31, 2012 1441 WEST LONG LAKE ROAD [Member]	Dec. 31, 2012 1441 WEST LONG LAKE ROAD [Member] Minimum [Member]		Dec. 31, 2012 1441 WEST LONG LAKE ROAD [Member] Maximum [Member]		Dec. 31, 2012 1111 DURHAM AVENUE [Member]	Dec. 31, 2012 1111 DURHAM AVENUE [Member] Minimum [Member]		Dec. 31, 2012 1111 DURHAM AVENUE [Member] Maximum [Member]		Dec. 31, 2012 ENCLAVE PARKWAY 1430 [Member]	Dec. 31, 2012 ENCLAVE PARKWAY 1430 [Member] Minimum [Member]		Dec. 31, 2012 ENCLAVE PARKWAY 1430 [Member] Maximum [Member]		Dec. 31, 2012 CRESCENT RIDGE II [Member]	Dec. 31, 2012 CRESCENT RIDGE II [Member] Minimum [Member]		Dec. 31, 2012 CRESCENT RIDGE II [Member] Maximum [Member]		Dec. 31, 2012 CROWN COLONY DRIVE 1200 [Member]		Dec. 31, 2012 CROWN COLONY DRIVE 1200 [Member] Minimum [Member]		Dec. 31, 2012 CROWN COLONY DRIVE 1200 [Member] Maximum [Member]		Dec. 31, 2012 HIATUS ROAD 5601 [Member]	Dec. 31, 2012 HIATUS ROAD 5601 [Member] Minimum [Member]		Dec. 31, 2012 HIATUS ROAD 5601 [Member] Maximum [Member]		Dec. 31, 2012 WINDY POINT I [Member]	Dec. 31, 2012 WINDY POINT I [Member] Minimum [Member]		Dec. 31, 2012 WINDY POINT I [Member] Maximum [Member]		Dec. 31, 2012 WINDY POINT II [Member]	Dec. 31, 2012 WINDY POINT II [Member] Minimum [Member]		Dec. 31, 2012 WINDY POINT II [Member] Maximum [Member]		Dec. 31, 2012 SARASOTA COMMERCE CENTER II [Member]	Dec. 31, 2012 SARASOTA COMMERCE CENTER II [Member] Minimum [Member]		Dec. 31, 2012 SARASOTA COMMERCE CENTER II [Member] Maximum [Member]		Dec. 31, 2012 JOHNS CREEK PARKWAY 11695 [Member]	Dec. 31, 2012 JOHNS CREEK PARKWAY 11695 [Member] Minimum [Member]		Dec. 31, 2012 JOHNS CREEK PARKWAY 11695 [Member] Maximum [Member]		Dec. 31, 2012 BROOKSIDE PARKWAY 3750 [Member]	Dec. 31, 2012 BROOKSIDE PARKWAY 3750 [Member] Minimum [Member]		Dec. 31, 2012 BROOKSIDE PARKWAY 3750 [Member] Maximum [Member]		Dec. 31, 2012 NW 64TH STREET 2001 [Member]		Dec. 31, 2012 NW 64TH STREET 2001 [Member] Minimum [Member]		Dec. 31, 2012 NW 64TH STREET 2001 [Member] Maximum [Member]		Dec. 31, 2012 CENTRAL STREET 90 [Member]	Dec. 31, 2012 CENTRAL STREET 90 [Member] Minimum [Member]		Dec. 31, 2012 CENTRAL STREET 90 [Member] Maximum [Member]		Dec. 31, 2012 DESERT CANYON 300 [Member]	Dec. 31, 2012 DESERT CANYON 300 [Member] Minimum [Member]		Dec. 31, 2012 DESERT CANYON 300 [Member] Maximum [Member]		Dec. 31, 2012 CONNECTION DRIVE 6031 [Member]	Dec. 31, 2012 CONNECTION DRIVE 6031 [Member] Minimum [Member]		Dec. 31, 2012 CONNECTION DRIVE 6031 [Member] Maximum [Member]		Dec. 31, 2012 CONNECTION DRIVE 6021 [Member]	Dec. 31, 2012 CONNECTION DRIVE 6021 [Member] Minimum [Member]		Dec. 31, 2012 CONNECTION DRIVE 6021 [Member] Maximum [Member]		Dec. 31, 2012 CONNECTION DRIVE 6011 [Member]	Dec. 31, 2012 CONNECTION DRIVE 6011 [Member] Minimum [Member]		Dec. 31, 2012 CONNECTION DRIVE 6011 [Member] Maximum [Member]		Dec. 31, 2012 BRAKER POINTE III [Member]		Dec. 31, 2012 BRAKER POINTE III [Member] Minimum [Member]		Dec. 31, 2012 BRAKER POINTE III [Member] Maximum [Member]		Dec. 31, 2012 CHANDLER FORUM [Member]	Dec. 31, 2012 CHANDLER FORUM [Member] Minimum [Member]		Dec. 31, 2012 CHANDLER FORUM [Member] Maximum [Member]		Dec. 31, 2012 GATEHALL DRIVE 2 [Member]		Dec. 31, 2012 GATEHALL DRIVE 2 [Member] Minimum [Member]		Dec. 31, 2012 GATEHALL DRIVE 2 [Member] Maximum [Member]		Dec. 31, 2012 SPECTRUM LOOP 350 [Member]	Dec. 31, 2012 SPECTRUM LOOP 350 [Member] Minimum [Member]		Dec. 31, 2012 SPECTRUM LOOP 350 [Member] Maximum [Member]		Dec. 31, 2012 HEADQUARTERS DRIVE 5601 [Member]	Dec. 31, 2012 HEADQUARTERS DRIVE 5601 [Member] Minimum [Member]		Dec. 31, 2012 HEADQUARTERS DRIVE 5601 [Member] Maximum [Member]		Dec. 31, 2012 TWO INDEPENDENCE SQUARE [Member]		Dec. 31, 2012 TWO INDEPENDENCE SQUARE [Member] Minimum [Member]		Dec. 31, 2012 TWO INDEPENDENCE SQUARE [Member] Maximum [Member]		Dec. 31, 2012 ONE INDEPENDENCE SQUARE [Member]		Dec. 31, 2012 ONE INDEPENDENCE SQUARE [Member] Minimum [Member]		Dec. 31, 2012 ONE INDEPENDENCE SQUARE [Member] Maximum [Member]		Dec. 31, 2012 WEST END AVENUE 2120 [Member]		Dec. 31, 2012 WEST END AVENUE 2120 [Member] Minimum [Member]		Dec. 31, 2012 WEST END AVENUE 2120 [Member] Maximum [Member]		Dec. 31, 2012 NORTH BRAND BOULEVARD 800 [Member]	Dec. 31, 2012 NORTH BRAND BOULEVARD 800 [Member] Minimum [Member]		Dec. 31, 2012 NORTH BRAND BOULEVARD 800 [Member] Maximum [Member]		Dec. 31, 2012 EASTPOINT I [Member]	Dec. 31, 2012 EASTPOINT I [Member] Minimum [Member]		Dec. 31, 2012 EASTPOINT I [Member] Maximum [Member]		Dec. 31, 2012 EASTPOINT II [Member]	Dec. 31, 2012 EASTPOINT II [Member] Minimum [Member]		Dec. 31, 2012 EASTPOINT II [Member] Maximum [Member]		Dec. 31, 2012 WEST JEFFERSON 150 [Member]	Dec. 31, 2012 WEST JEFFERSON 150 [Member] Minimum [Member]		Dec. 31, 2012 WEST JEFFERSON 150 [Member] Maximum [Member]		Dec. 31, 2012 US BANCORP CENTER [Member]	Dec. 31, 2012 US BANCORP CENTER [Member] Minimum [Member]		Dec. 31, 2012 US BANCORP CENTER [Member] Maximum [Member]		Dec. 31, 2012 AON CENTER [Member]	Dec. 31, 2012 AON CENTER [Member] Minimum [Member]		Dec. 31, 2012 AON CENTER [Member] Maximum [Member]		Dec. 31, 2012 AUBURN HILLS CORPORATE CENTER [Member]	Dec. 31, 2012 AUBURN HILLS CORPORATE CENTER [Member] Minimum [Member]		Dec. 31, 2012 AUBURN HILLS CORPORATE CENTER [Member] Maximum [Member]		Dec. 31, 2012 SUNSET HILLS ROAD 11107 [Member]	Dec. 31, 2012 SUNSET HILLS ROAD 11107 [Member] Minimum [Member]		Dec. 31, 2012 SUNSET HILLS ROAD 11107 [Member] Maximum [Member]		Dec. 31, 2012 SUNSET HILLS ROAD 11109 [Member]	Dec. 31, 2012 SUNSET HILLS ROAD 11109 [Member] Minimum [Member]		Dec. 31, 2012 SUNSET HILLS ROAD 11109 [Member] Maximum [Member]		Dec. 31, 2012 CORPORATE BOULEVARD 9211 [Member]	Dec. 31, 2012 CORPORATE BOULEVARD 9211 [Member] Minimum [Member]		Dec. 31, 2012 CORPORATE BOULEVARD 9211 [Member] Maximum [Member]		Dec. 31, 2012 CORPORATE BOULEVARD 9221 [Member]	Dec. 31, 2012 CORPORATE BOULEVARD 9221 [Member] Minimum [Member]		Dec. 31, 2012 CORPORATE BOULEVARD 9221 [Member] Maximum [Member]		Dec. 31, 2012 GLENRIDGE HIGHLANDS TWO [Member]	Dec. 31, 2012 GLENRIDGE HIGHLANDS TWO [Member] Minimum [Member]		Dec. 31, 2012 GLENRIDGE HIGHLANDS TWO [Member] Maximum [Member]		Dec. 31, 2012 BRIDGEWATER CROSSING 200 [Member]		Dec. 31, 2012 BRIDGEWATER CROSSING 200 [Member] Minimum [Member]		Dec. 31, 2012 BRIDGEWATER CROSSING 200 [Member] Maximum [Member]		Dec. 31, 2012 EAST COLORADO BOULEVARD 1055 [Member]	Dec. 31, 2012 EAST COLORADO BOULEVARD 1055 [Member] Minimum [Member]		Dec. 31, 2012 EAST COLORADO BOULEVARD 1055 [Member] Maximum [Member]		Dec. 31, 2012 FAIRWAY CENTER II [Member]		Dec. 31, 2012 FAIRWAY CENTER II [Member] Minimum [Member]		Dec. 31, 2012 FAIRWAY CENTER II [Member] Maximum [Member]		Dec. 31, 2012 COPPER RIDGE CENTER [Member]	Dec. 31, 2012 COPPER RIDGE CENTER [Member] Minimum [Member]		Dec. 31, 2012 COPPER RIDGE CENTER [Member] Maximum [Member]		Dec. 31, 2012 MAIN STREET 1901 [Member]	Dec. 31, 2012 MAIN STREET 1901 [Member] Minimum [Member]		Dec. 31, 2012 MAIN STREET 1901 [Member] Maximum [Member]		Dec. 31, 2012 VIRGINIA AVE 400 [Member]	Dec. 31, 2012 VIRGINIA AVE 400 [Member] Minimum [Member]		Dec. 31, 2012 VIRGINIA AVE 400 [Member] Maximum [Member]		Dec. 31, 2012 NORTH FAIRFAX DRIVE 4250 [Member]	Dec. 31, 2012 NORTH FAIRFAX DRIVE 4250 [Member] Minimum [Member]		Dec. 31, 2012 NORTH FAIRFAX DRIVE 4250 [Member] Maximum [Member]		Dec. 31, 2012 EYE STREET 1225 [Member]		Dec. 31, 2012 EYE STREET 1225 [Member] Minimum [Member]		Dec. 31, 2012 EYE STREET 1225 [Member] Maximum [Member]		Dec. 31, 2012 EYE STREET 1201 [Member]		Dec. 31, 2012 EYE STREET 1201 [Member] Minimum [Member]		Dec. 31, 2012 EYE STREET 1201 [Member] Maximum [Member]		Dec. 31, 2012 MARKET STREET 1901 [Member]	Dec. 31, 2012 MARKET STREET 1901 [Member] Minimum [Member]		Dec. 31, 2012 MARKET STREET 1901 [Member] Maximum [Member]		Dec. 31, 2012 BROAD STREET 60 [Member]	Dec. 31, 2012 BROAD STREET 60 [Member] Minimum [Member]		Dec. 31, 2012 BROAD STREET 60 [Member] Maximum [Member]		Dec. 31, 2012 MASSACHUSETTS AVENUE 1414 [Member]	Dec. 31, 2012 MASSACHUSETTS AVENUE 1414 [Member] Minimum [Member]		Dec. 31, 2012 MASSACHUSETTS AVENUE 1414 [Member] Maximum [Member]		Dec. 31, 2012 ONE BRATTLE SQUARE [Member]	Dec. 31, 2012 ONE BRATTLE SQUARE [Member] Minimum [Member]		Dec. 31, 2012 ONE BRATTLE SQUARE [Member] Maximum [Member]		Dec. 31, 2012 CORPORATE DRIVE 600 [Member]	Dec. 31, 2012 CORPORATE DRIVE 600 [Member] Minimum [Member]		Dec. 31, 2012 CORPORATE DRIVE 600 [Member] Maximum [Member]		Dec. 31, 2012 WEST ENTRANCE DRIVE 1075 [Member]	Dec. 31, 2012 WEST ENTRANCE DRIVE 1075 [Member] Minimum [Member]		Dec. 31, 2012 WEST ENTRANCE DRIVE 1075 [Member] Maximum [Member]		Dec. 31, 2012 CLARENDON BOULEVARD 3100 [Member]	Dec. 31, 2012 CLARENDON BOULEVARD 3100 [Member] Minimum [Member]		Dec. 31, 2012 CLARENDON BOULEVARD 3100 [Member] Maximum [Member]		Dec. 31, 2012 CORPORATE BOULEVARD 9200 [Member]	Dec. 31, 2012 CORPORATE BOULEVARD 9200 [Member] Minimum [Member]		Dec. 31, 2012 CORPORATE BOULEVARD 9200 [Member] Maximum [Member]		Dec. 31, 2012 BRIDGEWATER CROSSING 400 [Member]		Dec. 31, 2012 BRIDGEWATER CROSSING 400 [Member] Minimum [Member]		Dec. 31, 2012 BRIDGEWATER CROSSING 400 [Member] Maximum [Member]		Dec. 31, 2012 LAS COLINAS CORPORATE CENTER I [Member]	Dec. 31, 2012 LAS COLINAS CORPORATE CENTER I [Member] Minimum [Member]		Dec. 31, 2012 LAS COLINAS CORPORATE CENTER I [Member] Maximum [Member]		Dec. 31, 2012 LAS COLINAS CORPORATE CENTER II [Member]	Dec. 31, 2012 LAS COLINAS CORPORATE CENTER II [Member] Minimum [Member]		Dec. 31, 2012 LAS COLINAS CORPORATE CENTER II [Member] Maximum [Member]		Dec. 31, 2012 TWO PIERCE PLACE [Member]	Dec. 31, 2012 TWO PIERCE PLACE [Member] Minimum [Member]		Dec. 31, 2012 TWO PIERCE PLACE [Member] Maximum [Member]		Dec. 31, 2012 CABOT DRIVE 2300 [Member]	Dec. 31, 2012 CABOT DRIVE 2300 [Member] Minimum [Member]		Dec. 31, 2012 CABOT DRIVE 2300 [Member] Maximum [Member]		Dec. 31, 2012 PIEDMONT POINTE I [Member]	Dec. 31, 2012 PIEDMONT POINTE I [Member] Minimum [Member]		Dec. 31, 2012 PIEDMONT POINTE I [Member] Maximum [Member]		Dec. 31, 2012 PIEDMONT POINTE II [Member]	Dec. 31, 2012 PIEDMONT POINTE II [Member] Minimum [Member]		Dec. 31, 2012 PIEDMONT POINTE II [Member] Maximum [Member]		Dec. 31, 2012 SUWANEE GATEWAY ONE [Member]	Dec. 31, 2012 SUWANEE GATEWAY ONE [Member] Minimum [Member]		Dec. 31, 2012 SUWANEE GATEWAY ONE [Member] Maximum [Member]		Dec. 31, 2012 ONE MERIDIAN CROSSINGS [Member]	Dec. 31, 2012 ONE MERIDIAN CROSSINGS [Member] Minimum [Member]		Dec. 31, 2012 ONE MERIDIAN CROSSINGS [Member] Maximum [Member]		Dec. 31, 2012 TWO MERIDIAN CROSSINGS [Member]	Dec. 31, 2012 TWO MERIDIAN CROSSINGS [Member] Minimum [Member]		Dec. 31, 2012 TWO MERIDIAN CROSSINGS [Member] Maximum [Member]		Dec. 31, 2012 ENCLAVE PARKWAY 1200 [Member]	Dec. 31, 2012 ENCLAVE PARKWAY 1200 [Member] Minimum [Member]		Dec. 31, 2012 ENCLAVE PARKWAY 1200 [Member] Maximum [Member]		Dec. 31, 2012 W MONROE 500 [Member]	Dec. 31, 2012 W MONROE 500 [Member] Minimum [Member]		Dec. 31, 2012 W MONROE 500 [Member] Maximum [Member]		Dec. 31, 2012 THE DUPREE [Member]	Dec. 31, 2012 THE DUPREE [Member] Minimum [Member]		Dec. 31, 2012 THE DUPREE [Member] Maximum [Member]		Dec. 31, 2012 THE MEDICI [Member]	Dec. 31, 2012 THE MEDICI [Member] Minimum [Member]		Dec. 31, 2012 THE MEDICI [Member] Maximum [Member]		Dec. 31, 2012 PRESIDENTIAL WAY 225 [Member]	Dec. 31, 2012 PRESIDENTIAL WAY 225 [Member] Minimum [Member]		Dec. 31, 2012 PRESIDENTIAL WAY 225 [Member] Maximum [Member]		Dec. 31, 2012 PRESIDENTIAL WAY 235 [Member]	Dec. 31, 2012 PRESIDENTIAL WAY 235 [Member] Minimum [Member]		Dec. 31, 2012 PRESIDENTIAL WAY 235 [Member] Maximum [Member]		Dec. 31, 2012 400 TOWNPARK [Member]	Dec. 31, 2012 400 TOWNPARK [Member] Minimum [Member]		Dec. 31, 2012 400 TOWNPARK [Member] Maximum [Member]		Dec. 31, 2012 PIEDMONT POWER, LLC [Member]		Dec. 31, 2012 PIEDMONT POWER, LLC [Member] Minimum [Member]		Dec. 31, 2012 PIEDMONT POWER, LLC [Member] Maximum [Member]		Dec. 31, 2012 UNDEVELOPED LAND PARCELS [Member]		Dec. 31, 2012 Building 2020 [Member]	Dec. 31, 2012 Building 2020 [Member] Minimum [Member]		Dec. 31, 2012 Building 2020 [Member] Maximum [Member]		Dec. 31, 2012 INVESTMENT DRIVE 4685 [Member]	Dec. 31, 2012 INVESTMENT DRIVE 4685 [Member] Minimum [Member]		Dec. 31, 2012 INVESTMENT DRIVE 4685 [Member] Maximum [Member]		Dec. 31, 2012 MARYLAND WAY 5301 [Member]	Dec. 31, 2012 MARYLAND WAY 5301 [Member] Minimum [Member]		Dec. 31, 2012 MARYLAND WAY 5301 [Member] Maximum [Member]		Dec. 31, 2012 UPLAND DRIVE 8560 [Member]	Dec. 31, 2012 UPLAND DRIVE 8560 [Member] Minimum [Member]		Dec. 31, 2012 UPLAND DRIVE 8560 [Member] Maximum [Member]		Dec. 31, 2012 TWO PARK CENTER [Member]	Dec. 31, 2012 TWO PARK CENTER [Member] Minimum [Member]		Dec. 31, 2012 TWO PARK CENTER [Member] Maximum [Member]		Dec. 31, 2011 Interlocken Building 360 [Member]	Dec. 31, 2011 Interlocken Building 360 [Member] Fund IX, X, XI and REIT Joint Venture [Member]	Dec. 31, 2012 Secured Debt [Member] $350.0 Million Secured Pooled Facility [Member]	Dec. 31, 2012 Eye Street 1225 NW Associates LLC [Member]	Dec. 31, 2012 Eye Street 1225 NW Associates LLC [Member] 1225 Equity LLC [Member]	Dec. 31, 2012 Eye Street 1201 NW Associates LLC [Member]	Dec. 31, 2012 Eye Street 1201 NW Associates LLC [Member] 1201 Equity LLC [Member]	Dec. 31, 2012 Building Improvements [Member] Minimum [Member]	Dec. 31, 2012 Building Improvements [Member] Maximum [Member]	Dec. 31, 2012 Land Improvements [Member] Minimum [Member]	Dec. 31, 2012 Land Improvements [Member] Maximum [Member]	Dec. 31, 2012 Building [Member]	Dec. 31, 2012 Wholly Owned Properties [Member]	Dec. 31, 2012 Partially Owned Properties [Member]	May 31, 2010 Sylvan Avenue 111 Building [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage							100.00%					100.00%	[1]					100.00%	[1]					100.00%					100.00%					100.00%					100.00%					100.00%	[2]					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%	[1]					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%	[2]					100.00%					100.00%	[2]					100.00%					100.00%					100.00%	[2]					100.00%	[2]					100.00%	[2]					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%	[2]					100.00%					100.00%	[2]					100.00%					100.00%					100.00%					100.00%					49.50%	[3]					49.50%	[4]					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%	[2]					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%	[5]					100.00%	[6]	57.00%					55.00%					55.00%					72.00%					72.00%
Encumbrances																																		$ 32,100,000										$ 20,200,000	[2]										$ 23,400,000					$ 40,300,000																																																			$ 16,500,000	[2]										$ 42,700,000	[2]															$ 105,800,000	[2]					$ 57,800,000	[2]					$ 26,800,000	[2]																									$ 105,000,000					$ 225,000,000																																			$ 40,200,000	[2]					$ 29,200,000					$ 10,700,000	[2]																				$ 45,000,000					$ 57,600,000	[3]					$ 82,400,000	[4]																																													$ 29,300,000	[2]					$ 17,500,000					$ 25,025,000																																													$ 140,000,000
Initial Cost, Land	610,371,000						1,456,000					0	[1]					0	[1]					2,160,000					9,653,000					7,100,000					7,700,000					11,042,000	[2]					3,642,000					4,537,000					3,746,000					1,767,000					2,080,000					1,561,000					0	[1]					3,642,000					2,602,000					3,157,000					3,157,000					3,157,000					6,098,000	[2]					2,632,000					9,054,000	[2]					2,185,000					3,153,000					52,711,000	[2]					29,765,000	[2]					4,908,000	[2]					23,605,000					1,485,000					1,235,000					9,759,000					11,138,000					23,267,000					1,978,000					2,711,000					1,218,000					3,019,000					3,019,000					6,662,000					8,182,000	[2]					6,495,000					7,110,000	[2]					6,974,000					6,246,000					22,146,000					13,636,000					21,959,000	[3]					31,985,000	[4]					13,584,000					32,522,000					4,210,000					6,974,000					3,934,000					5,200,000					11,700,000					3,730,000					10,400,000	[2]					3,912,000					4,496,000					4,370,000					4,390,000					11,200,000					13,300,000					1,000,000					2,919,000					2,661,000					3,460,000					36,990,000					4,080,000					1,780,000					3,626,000					4,154,000					2,570,000					0	[5]					6,021,000	[6]	1,696,000					2,144,000					4,300,000					1,954,000					600,000																	599,677,000	10,694,000
Initial Cost, Buildings and Improvements	3,907,382,000						20,377,000					16,036,000	[1]					13,272,000	[1]					16,776,000					20,495,000					37,915,000					45,154,000					40,666,000	[2]					10,404,000					31,847,000					55,026,000					20,533,000					13,572,000					14,207,000					7,172,000	[1]					29,497,000					24,333,000					43,656,000					42,662,000					29,034,000					34,492,000	[2]					0					96,722,000	[2]					24,964,000					24,602,000					202,702,000	[2]					104,814,000	[2]					59,011,000	[2]					136,284,000					11,064,000					9,199,000					88,364,000					175,629,000					472,488,000					16,570,000					17,890,000					8,038,000					21,984,000					21,984,000					69,031,000					84,160,000	[2]					30,265,000					15,600,000	[2]					38,714,000					36,455,000					49,740,000					70,918,000					47,602,000	[3]					63,139,000	[4]					166,683,000					168,986,000					35,821,000					64,940,000					0					22,957,000					69,705,000					16,608,000					71,052,000	[2]					18,830,000					29,881,000					70,632,000					19,549,000					58,606,000					70,618,000					6,875,000					24,398,000					25,742,000					15,047,000					185,113,000					14,310,000					11,510,000					36,916,000					44,048,000					20,555,000					79,000	[5]					427,000	[6]	7,851,000					9,984,000					20,702,000					11,216,000					22,682,000																	3,834,947,000	72,435,000
Initial Cost, Total	4,517,753,000						21,837,000					16,036,000	[1]					13,272,000	[1]					18,936,000					30,148,000					45,015,000					52,854,000					51,708,000	[2]					14,046,000					36,384,000					58,772,000					22,300,000					15,652,000					15,768,000					7,172,000	[1]					33,139,000					26,935,000					46,813,000					45,819,000					32,191,000					40,590,000	[2]					2,632,000					105,776,000	[2]					27,149,000					27,755,000					255,413,000	[2]					134,579,000	[2]					63,919,000	[2]					159,889,000					12,549,000					10,434,000					98,123,000					186,767,000					495,755,000					18,548,000					20,601,000					9,256,000					25,003,000					25,003,000					75,693,000					92,342,000	[2]					36,760,000					22,710,000	[2]					45,688,000					42,701,000					71,886,000					84,554,000					69,561,000	[3]					95,124,000	[4]					180,267,000					201,508,000					40,031,000					71,914,000					3,934,000					28,157,000					81,405,000					20,338,000					81,452,000	[2]					22,742,000					34,377,000					75,002,000					23,939,000					69,806,000					83,918,000					7,875,000					27,317,000					28,403,000					18,507,000					222,103,000					18,390,000					13,290,000					40,542,000					48,202,000					23,125,000					79,000	[5]					6,448,000	[6]	9,547,000					12,128,000					25,002,000					13,170,000					23,282,000																	4,434,624,000	83,129,000
Costs Capitalized Subsequent to Acquisition	131,147,000						3,047,000					7,309,000	[1]					551,000	[1]					(6,760,000)					(11,547,000)					3,700,000					7,954,000					1,970,000	[2]					1,722,000					2,341,000					1,096,000					2,249,000					1,648,000					112,000					769,000	[1]					2,630,000					100,000					2,419,000					1,397,000					2,586,000					1,000	[2]					19,917,000					33,000	[2]					(1,894,000)					2,663,000					21,374,000	[2]					2,770,000	[2]					6,671,000	[2]					8,900,000					423,000					1,895,000					3,846,000					7,614,000					125,542,000					(8,159,000)					1,371,000					(2,338,000)					(4,844,000)					(4,822,000)					(22,036,000)					(17,783,000)	[2]					(8,338,000)					(2,298,000)	[2]					(5,675,000)					(5,019,000)					(1,856,000)					5,098,000					(2,559,000)	[3]					(3,133,000)	[4]					137,000					(5,994,000)					1,988,000					(3,814,000)					16,281,000					(313,000)					(5,363,000)					(1,624,000)					(8,218,000)	[2]					(2,279,000)					(7,083,000)					1,667,000					(2,849,000)					7,339,000					6,279,000					78,000					(1,000)					99,000					6,189,000					(20,929,000)					55,000					728,000					(764,000)					(911,000)					580,000					3,079,000	[5]					2,987,000	[6]	(1,259,000)					2,902,000					1,360,000					1,084,000					(2,941,000)																	130,001,000	1,146,000
Gross Amount at Which Carried, Land	640,687,000						1,517,000					0	[1]					0	[1]					1,202,000					3,728,000					5,506,000					8,021,000					11,042,000	[2]					3,642,000					4,537,000					3,746,000					2,203,000					2,081,000					1,561,000					0	[1]					3,642,000					2,602,000					3,157,000					3,157,000					3,157,000					6,099,000	[2]					2,779,000					9,054,000	[2]					2,186,000					3,153,000					52,711,000	[2]					30,562,000	[2]					5,100,000	[2]					23,607,000					1,485,000					1,235,000					9,759,000					11,138,000					23,966,000					1,591,000					2,711,000					1,218,000					2,960,000					2,960,000					6,662,000					8,328,000	[2]					6,495,000					7,110,000	[2]					6,974,000					6,246,000					22,146,000					13,636,000					21,959,000	[3]					31,985,000	[4]					20,829,000					60,708,000					4,365,000					7,113,000					3,934,000					5,207,000					11,791,000					3,882,000					10,400,000	[2]					2,543,000					2,543,000					4,370,000					4,390,000					11,200,000					13,300,000					1,000,000					2,919,000					2,661,000					3,460,000					36,990,000					4,080,000					1,780,000					3,612,000					4,138,000					2,570,000					0	[5]					9,435,000	[6]	1,767,000					2,233,000					4,479,000					2,048,000					624,000																	629,536,000	11,151,000
Gross Amount at Which Carried, Buildings and Improvements	4,008,217,000						23,367,000					23,345,000	[1]					13,823,000	[1]					10,974,000					14,873,000					43,209,000					52,787,000					42,636,000	[2]					12,126,000					34,188,000					56,122,000					22,346,000					15,219,000					14,319,000					7,941,000	[1]					32,127,000					24,433,000					46,075,000					44,059,000					31,620,000					34,492,000	[2]					19,770,000					96,755,000	[2]					23,069,000					27,265,000					224,076,000	[2]					106,787,000	[2]					65,490,000	[2]					145,182,000					11,487,000					11,094,000					92,210,000					183,243,000					597,331,000					8,798,000					19,261,000					5,700,000					17,199,000					17,221,000					46,995,000					66,231,000	[2]					21,927,000					13,302,000	[2]					33,039,000					31,436,000					47,884,000					76,016,000					45,043,000	[3]					60,006,000	[4]					159,575,000					134,806,000					37,654,000					60,987,000					16,281,000					22,637,000					64,251,000					14,832,000					62,834,000	[2]					17,920,000					24,751,000					72,299,000					16,700,000					65,945,000					76,897,000					6,953,000					24,397,000					25,841,000					21,236,000					164,184,000					14,365,000					12,238,000					36,166,000					43,153,000					21,135,000					3,158,000	[5]							6,521,000					12,797,000					21,883,000					12,206,000					19,717,000																	3,935,093,000	73,124,000
Gross Amount at Which Carried, Total	4,648,904,000						24,884,000					23,345,000	[1]					13,823,000	[1]					12,176,000					18,601,000					48,715,000					60,808,000					53,678,000	[2]					15,768,000					38,725,000					59,868,000					24,549,000					17,300,000					15,880,000					7,941,000	[1]					35,769,000					27,035,000					49,232,000					47,216,000					34,777,000					40,591,000	[2]					22,549,000					105,809,000	[2]					25,255,000					30,418,000					276,787,000	[2]					137,349,000	[2]					70,590,000	[2]					168,789,000					12,972,000					12,329,000					101,969,000					194,381,000					621,297,000					10,389,000					21,972,000					6,918,000					20,159,000					20,181,000					53,657,000					74,559,000	[2]					28,422,000					20,412,000	[2]					40,013,000					37,682,000					70,030,000					89,652,000					67,002,000	[3]					91,991,000	[4]					180,404,000					195,514,000					42,019,000					68,100,000					20,215,000					27,844,000					76,042,000					18,714,000					73,234,000	[2]					20,463,000					27,294,000					76,669,000					21,090,000					77,145,000					90,197,000					7,953,000					27,316,000					28,502,000					24,696,000					201,174,000					18,445,000					14,018,000					39,778,000					47,291,000					23,705,000					3,158,000	[5]					9,435,000	[6]	8,288,000					15,030,000					26,362,000					14,254,000					20,341,000																	4,564,629,000	84,275,000
Accumulated Depreciation and Amortization	977,768,000		935,716,000		918,578,000		8,826,000					6,291,000	[1]					4,902,000	[1]					6,766,000					8,378,000					14,686,000					19,404,000					13,020,000	[2]					3,404,000					10,157,000					16,575,000					6,732,000					4,695,000					4,189,000					2,177,000	[1]					9,799,000					6,906,000					12,465,000					12,756,000					9,395,000					9,544,000	[2]					6,334,000					26,514,000	[2]					6,313,000					6,797,000					55,720,000	[2]					28,479,000	[2]					17,776,000	[2]					39,209,000					2,972,000					3,155,000					25,154,000					46,382,000					143,225,000					3,763,000					4,901,000					1,490,000					4,186,000					4,194,000					11,536,000					14,672,000	[2]					5,494,000					3,003,000	[2]					8,408,000					8,681,000					11,467,000					21,922,000					11,262,000	[3]					13,985,000	[4]					44,068,000					33,533,000					13,114,000					23,204,000					4,561,000					4,694,000					12,864,000					2,987,000					15,093,000	[2]					6,527,000					4,591,000					16,258,000					4,640,000					8,407,000					8,670,000					405,000					1,550,000					1,824,000					949,000					8,565,000					1,067,000					777,000					2,038,000					2,421,000					1,029,000					0	[5]							3,906,000					6,029,000					7,242,000					3,612,000					5,082,000																	951,897,000	25,871,000
Life on which Depreciation and Amortization is Computed								0 years	[7]	40 years	[7]			0 years	[1],[7]	40 years	[1],[7]			0 years	[1],[7]	40 years	[1],[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]			0 years	[2],[7]	40 years	[2],[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]			0 years	[1],[7]	40 years	[1],[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]			0 years	[2],[7]	40 years	[2],[7]		0 years	[7]	40 years	[7]			0 years	[2],[7]	40 years	[2],[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]			0 years	[2],[7]	40 years	[2],[7]			0 years	[2],[7]	40 years	[2],[7]			0 years	[2],[7]	40 years	[2],[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]			0 years	[2],[7]	40 years	[2],[7]		0 years	[7]	40 years	[7]			0 years	[2],[7]	40 years	[2],[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]			0 years	[3],[7]	40 years	[3],[7]			0 years	[4],[7]	40 years	[4],[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]			0 years	[2],[7]	40 years	[2],[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]			0 years	[5],[7]	40 years	[5],[7]				0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]		0 years	[7]	40 years	[7]
Debt instrument, face amount																																																																																																																																																																																																																																																																																																																																																																																																																																										350,000,000
Piedmont’s % Ownership of Entity																																																																																																																																																																																																																																																																																																																																																																																																																																											49.50%	49.50%	49.50%	49.50%
Useful life																																																																																																																																																																																																																																																																																																																																																																																																																																															5 years	25 years	20 years	25 years	40 years
Real Estate:
Balance at the beginning of the year	4,699,311,000		4,666,188,000		4,681,313,000
Additions to/improvements of real estate	108,131,000		440,141,000		105,282,000
Assets disposed	(77,768,000)		(361,397,000)		(72,586,000)
Assets impaired	0		0		(8,489,000)	[8]
Write-offs of intangible assets	(73,632,000)	[9]	(35,916,000)	[9]	0	[9]
Write-offs of fully depreciated/amortized assets	(7,138,000)		(9,705,000)		(39,332,000)
Balance at the end of the year	4,648,904,000		4,699,311,000		4,666,188,000
Accumulated Depreciation and Amortization:
Balance at the beginning of the year	935,716,000		918,578,000		840,545,000		8,826,000					6,291,000	[1]					4,902,000	[1]					6,766,000					8,378,000					14,686,000					19,404,000					13,020,000	[2]					3,404,000					10,157,000					16,575,000					6,732,000					4,695,000					4,189,000					2,177,000	[1]					9,799,000					6,906,000					12,465,000					12,756,000					9,395,000					9,544,000	[2]					6,334,000					26,514,000	[2]					6,313,000					6,797,000					55,720,000	[2]					28,479,000	[2]					17,776,000	[2]					39,209,000					2,972,000					3,155,000					25,154,000					46,382,000					143,225,000					3,763,000					4,901,000					1,490,000					4,186,000					4,194,000					11,536,000					14,672,000	[2]					5,494,000					3,003,000	[2]					8,408,000					8,681,000					11,467,000					21,922,000					11,262,000	[3]					13,985,000	[4]					44,068,000					33,533,000					13,114,000					23,204,000					4,561,000					4,694,000					12,864,000					2,987,000					15,093,000	[2]					6,527,000					4,591,000					16,258,000					4,640,000					8,407,000					8,670,000					405,000					1,550,000					1,824,000					949,000					8,565,000					1,067,000					777,000					2,038,000					2,421,000					1,029,000					0	[5]							3,906,000					6,029,000					7,242,000					3,612,000					5,082,000																	951,897,000	25,871,000
Depreciation and amortization expense	139,196,000		147,440,000		131,000,000
Assets disposed	(16,374,000)		(84,681,000)		(13,519,000)
Write-offs of intangible assets	(73,632,000)	[9]	(35,916,000)	[9]	0	[9]
Write-offs of fully depreciated/amortized assets	(7,138,000)		(9,705,000)		(39,448,000)
Balance at the end of the year	977,768,000		935,716,000		918,578,000		8,826,000					6,291,000	[1]					4,902,000	[1]					6,766,000					8,378,000					14,686,000					19,404,000					13,020,000	[2]					3,404,000					10,157,000					16,575,000					6,732,000					4,695,000					4,189,000					2,177,000	[1]					9,799,000					6,906,000					12,465,000					12,756,000					9,395,000					9,544,000	[2]					6,334,000					26,514,000	[2]					6,313,000					6,797,000					55,720,000	[2]					28,479,000	[2]					17,776,000	[2]					39,209,000					2,972,000					3,155,000					25,154,000					46,382,000					143,225,000					3,763,000					4,901,000					1,490,000					4,186,000					4,194,000					11,536,000					14,672,000	[2]					5,494,000					3,003,000	[2]					8,408,000					8,681,000					11,467,000					21,922,000					11,262,000	[3]					13,985,000	[4]					44,068,000					33,533,000					13,114,000					23,204,000					4,561,000					4,694,000					12,864,000					2,987,000					15,093,000	[2]					6,527,000					4,591,000					16,258,000					4,640,000					8,407,000					8,670,000					405,000					1,550,000					1,824,000					949,000					8,565,000					1,067,000					777,000					2,038,000					2,421,000					1,029,000					0	[5]							3,906,000					6,029,000					7,242,000					3,612,000					5,082,000																	951,897,000	25,871,000
Impairment charge																																																																																																																																																																																																																																																																																																																																																																																																																																																						7,000,000
Impairment loss on real estate assets	$ 0		$ 0		$ 7,041,000																																																																																																																																																																																																																																																																																																																																																																																																																																			$ 53,000	$ 1,400,000

[1] Property is owned subject to a long-term ground lease.

[2] These properties collateralize the $350 Million Secured Pooled Facility.

[3] Piedmont purchased all of the membership interest in 1225 Equity, LLC, which own a 49.5% membership interest in 1225 Eye Street, N.W. Associates, which owns the 1225 Eye Street building. As a result of its ownership of 1225 Equity, LLC, Piedmont owns an approximate 49.5% in the 1225 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.

[4] Piedmont purchased all of the membership interest in 1201 Equity, LLC, which own a 49.5% membership interest in 1201 Eye Street, N.W. Associates, which owns the 1201 Eye Street building. As a result of its ownership of 1201 Equity, LLC, Piedmont owns an approximate 49.5% in the 1201 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.

[5] Represents solar panels at the 400 Bridgewater Crossing building, which are not included in Piedmont’s total building count.

[6] Undeveloped Land Parcels are not included in Piedmont’s total building count.

[7] Piedmont’s assets are depreciated or amortized using the straight-lined method over the useful lives of the assets by class. Generally, Tenant Improvements are amortized over the shorter of economic life or lease term, and Lease Intangibles are amortized over the lease term. Generally, Building Improvements are depreciated over 5 - 25 years, Land Improvements are depreciated over 20 - 25 years, and Buildings are depreciated over 40 years.

[8] Piedmont recorded an impairment charge against real estate assets of approximately $7.0 million related to the 111 Sylvan Avenue building at the time it was classified as held-for-sale in May 2010. This wholly-owned asset was subsequently sold in December 2010. In addition, the Fund IX, Fund XI, and REIT Joint Venture recorded an impairment loss on real estate assets of approximately $1.4 million during 2010 related to the 360 Interlocken building; however, Piedmont recorded its proporationate share of the charge (approximately $53,000) in the accompanying consolidated statements of income with other such net property operations as equity in income of unconsolidated joint ventures.

[9] Consists of write-offs of intangible lease assets related to lease restructurings, amendments and terminations.

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Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended
	Feb. 27, 2013 Dividend Declared [Member]	Feb. 13, 2013 Arlington Gateway [Member]
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.20
Purchase Price		$ 175.6

XML

Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Derivative Instruments [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions

A detail of Piedmont’s interest rate derivatives outstanding as of December 31, 2012 is as follows:

Interest Rate Derivatives:	Notional Amount (in millions)		Effective Date	Maturity Date
Interest rate swap	$	125	11/22/2011	11/22/2016
Interest rate swap	$	75	11/22/2011	11/22/2016
Interest rate swap	$	50	11/22/2011	11/22/2016
Interest rate swap	$	50	11/22/2011	11/22/2016
Interest rate swap	$	70	3/3/2014	3/3/2024
Total	$	370

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

All of Piedmont's interest rate swap agreements outstanding for the periods presented were designated as cash flow hedges of interest rate risk. As such, the effective portion of the changes in the fair value of these derivatives was recorded in other comprehensive income ("OCI") and subsequently reclassified into the accompanying consolidated statements of income for the years ended December 31, 2012, 2011, and 2010, respectively, as follows (in thousands):

Derivative in Cash Flow Hedging Relationships (Interest Rate Swaps and Caps)	2012			2011			2010
Amount of loss recognized in OCI on derivatives	$	7,656		$	3,064		$	1,529
Amount of previously recorded loss reclassified from accumulated OCI into interest expense	$	(3,033	)	$	(1,218	)	$	(4,704	)

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Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Eye Street 1201 NW Associates LLC [Member]
Variable Interest Entity [Line Items]
Piedmont’s % Ownership of Entity	49.50%
Net Carrying Amount	$ (5.7)	$ (3.4)
Variable Interst Entity, Cash Flow Percent Entitled To Entity	100.00%
Eye Street 1225 NW Associates LLC [Member]
Variable Interest Entity [Line Items]
Piedmont’s % Ownership of Entity	49.50%
Net Carrying Amount	(0.1)	0.6
Variable Interst Entity, Cash Flow Percent Entitled To Entity	100.00%
Piedmont Multi-State Owner, LLC [Member]
Variable Interest Entity [Line Items]
Piedmont’s % Ownership of Entity	100.00%
Net Carrying Amount	33.2	28.0
Piedmont 500 W. Monroe Fee LLC [Member]
Variable Interest Entity [Line Items]
Piedmont’s % Ownership of Entity	100.00%
Net Carrying Amount	194.0	76.9
Suwanee Gateway One LLC [Member]
Variable Interest Entity [Line Items]
Piedmont’s % Ownership of Entity	100.00%
Net Carrying Amount	7.6	7.7
Medici Atlanta LLC [Member]
Variable Interest Entity [Line Items]
Piedmont’s % Ownership of Entity	100.00%
Net Carrying Amount	13.7	13.0
400 TownPark, LLC [Member]
Variable Interest Entity [Line Items]
Piedmont’s % Ownership of Entity	100.00%
Net Carrying Amount	$ 23.5	$ 23.7

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Operating Leases

12 Months Ended

Dec. 31, 2012

Leases [Abstract]

Operating Leases

Operating Leases

Piedmont’s real estate assets are leased to tenants under operating leases for which the terms vary, including certain provisions to extend the lease term, options for early terminations subject to specified penalties, and other terms and conditions as negotiated. Piedmont retains substantially all of the risks and benefits of ownership of the real estate assets leased to tenants. Amounts required as security deposits vary depending upon the terms of the respective leases and the creditworthiness of the tenant, however, generally they are not significant. Exposure to credit risk is limited to the extent that the receivables exceed this amount. Security deposits related to tenant leases are included in accounts payable and accrued expenses in the accompanying consolidated balance sheets.

Piedmont’s wholly-owned and consolidated joint venture properties are located in 17 metropolitan areas. Based on annualized lease revenue as of December 31, 2012, approximately 23.1%, 22.0%, and 14.6% of these real estate assets are located in metropolitan Chicago, metropolitan Washington, D.C., and metropolitan New York, respectively. Furthermore, approximately 13.3% of Piedmont's annualized lease revenue is generated from federal governmental agencies.

The future minimum rental income from Piedmont’s investment in real estate assets under non-cancelable operating leases, excluding unconsolidated joint ventures, as of December 31, 2012, is presented below (in thousands):

Years ending December 31:
2013	$	377,746
2014	349,565
2015	346,084
2016	310,798
2017	290,158
Thereafter	1,384,133
Total	$	3,058,484

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Subsequent Events

12 Months Ended

Dec. 31, 2012

Subsequent Events [Abstract]

Subsequent Events

Subsequent events

Declaration of Dividend for the First Quarter 2013

On February 27, 2013, the board of directors of Piedmont declared dividends for the first quarter 2013 in the amount of $0.20 (20.00 cents) per share on its common stock to stockholders of record as of the close of business on March 8, 2013. Such dividends are to be paid on March 22, 2013.

Contract to Purchase Asset in Washington, D.C.

On February 13, 2013, Piedmont entered into a binding contract to purchase an office property located in Washington, D.C. for approximately $175.6 million, with an anticipated close date in March 2013.

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Line of Credit and Notes Payable (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Debt Instrument [Line Items]
Net borrowings	$ 129,000,000
Line of credit and notes payable, outstanding	1,416,525,000	[1]	1,472,525,000	[1]
Weighted average interest rate	4.30%	[1],[2]	4.29%	[2],[3]
Interest payments on debt facilities	62,600,000		66,700,000		70,200,000
Secured Debt [Member]
Debt Instrument [Line Items]
Line of credit and notes payable, outstanding	987,525,000	[1]	1,172,525,000	[1]
Weighted average interest rate	5.17%	[1],[2]
Unsecured Debt [Member]
Debt Instrument [Line Items]
Line of credit and notes payable, outstanding	429,000,000	[1]	300,000,000	[1]
Weighted average interest rate	2.30%	[1],[2]
$500 Million Unsecured Line of Credit [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	500,000,000
Maturity period	4 years
Number of extension periods	2
Extension period	6 months
Option to increase borrowing capacity, amount	500,000,000
Maximum borrowing capacity	1,000,000,000
Spread on variable rate	1.175%
Rate	1.39%	[2],[3]
Line of credit and notes payable, outstanding	129,000,000		0
LIBOR Interest Rate In Effect	0.22%
$500 Million Unsecured Facility [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	500,000,000
$45.0 Million Fixed-Rate Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	45,000,000
Repayments of secured debt	45,000,000
Rate	5.20%	[2]
Line of credit and notes payable, outstanding	0		45,000,000
$200.0 Million Mortgage Note [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	200,000,000
Rate	4.87%	[2]
Line of credit and notes payable, outstanding	200,000,000		200,000,000
$25.0 Million Mortgage Note [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	25,000,000
Rate	5.70%	[2]
Line of credit and notes payable, outstanding	25,000,000		25,000,000
$350.0 Million Secured Pooled Facility [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	350,000,000
Rate	4.84%	[2],[4]
Line of credit and notes payable, outstanding	350,000,000	[4]	350,000,000	[4]
Number of properties In collateralized pool	9
$105.0 Million Fixed-Rate Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	105,000,000
Rate	5.29%	[2]
Line of credit and notes payable, outstanding	105,000,000		105,000,000
$125.0 Million Fixed-Rate Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	125,000,000
Rate	5.50%	[2],[5]
Line of credit and notes payable, outstanding	125,000,000	[5]	125,000,000	[5]
Number of properties In collateralized pool	4
$42.5 Million Fixed-Rate Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	42,525,000
Rate	5.70%	[2]
Line of credit and notes payable, outstanding	42,525,000		42,525,000
$140 Million WDC Mortgage Notes [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	140,000,000
Rate	5.76%	[2]
Line of credit and notes payable, outstanding	140,000,000		140,000,000
$140.0 Million 500 W. Monroe Mortgage Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	140,000,000
Repayments of secured debt	140,000,000
Line of credit and notes payable, outstanding	0		140,000,000
$300 Million Unsecured Term Loan [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	300,000,000
Line of credit and notes payable, outstanding	$ 300,000,000		$ 300,000,000
Federal Funds Rate [Member] | $500 Million Unsecured Line of Credit [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Spread on variable rate	0.50%
LIBOR [Member] | $500 Million Unsecured Line of Credit [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Spread on variable rate	1.00%
LIBOR [Member] | $140.0 Million 500 W. Monroe Mortgage Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Spread on variable rate	1.008%	[2]
LIBOR [Member] | $300 Million Unsecured Term Loan [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Spread on variable rate	1.45%	[2],[6]
LIBOR [Member] | Minimum [Member] | $500 Million Unsecured Line of Credit [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Spread on variable rate	1.00%
LIBOR [Member] | Maximum [Member] | $500 Million Unsecured Line of Credit [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Spread on variable rate	1.75%
Interest Rate Swap [Member] | $300 Million Unsecured Term Loan [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Effective rate	2.69%

[1] Weighted average is based on contractual balance of outstanding debt and interest rates in the table as of December 31, 2012.

[2] All of Piedmont’s outstanding debt as of December 31, 2012 and 2011 is interest-only debt.

[3] Piedmont may select from multiple interest rate options with each draw, including the prime rate and various length LIBOR locks. All LIBOR selections are subject to an additional spread (1.175% as of December 31, 2012) over the selected rate based on Piedmont’s current credit rating. The outstanding balance as of December 31, 2012 consists of LIBOR draws at an average rate of 0.22% (subject to the additional spread mentioned above).

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

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

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

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Supplemental Disclosures of Noncash Activities (Tables)

12 Months Ended

Dec. 31, 2012

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

Significant noncash investing and financing activities for the years ended December 31, 2012, 2011, and 2010 (in thousands) are outlined below:

	2012			2011		2010
Accrued capital expenditures and deferred lease costs	$	12,598		$	8,218	$	8,047
Change in accrued offering costs related to issuance of common stock	$	(567	)	$	227	$	1,370
Net assets assumed upon consolidation of variable interest entity, net of notes receivable previously recorded	$	—		$	188,283	$	—
Liabilities assumed upon consolidation of variable interest entity	$	—		$	191,814	$	—
Redeemable common stock	$	—		$	—	$	75,164

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income attributable to Piedmont	$ 93,204	$ 225,041	$ 120,379
Other comprehensive (loss)/income:
Effective portion of loss on derivative instruments that are designated and qualify as cash flow hedges (See Note 8)	(7,656)	(3,064)	(1,529)
Less: reclassification of previously recorded loss included in net income (See Note 8)	3,033	1,218	4,704
Other comprehensive (loss)/income	(4,623)	(1,846)	3,175
Comprehensive income attributable to Piedmont	$ 88,581	$ 223,195	$ 123,554

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

Piedmont’s consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of Piedmont, Piedmont’s wholly-owned subsidiaries, any variable interest entity of which Piedmont or any of its wholly-owned subsidiaries is considered the primary beneficiary, or any entity in which Piedmont or any of its wholly-owned subsidiaries owns a controlling interest. In determining whether Piedmont or Piedmont OP has a controlling interest, the following factors, among others, are considered: equity ownership, voting rights, protective rights of investors, and participatory rights of investors.

Piedmont owns interests in three real properties through its ownership in Piedmont Washington Properties, Inc. Piedmont has evaluated this entity based on the criteria outlined above and concluded that it is not a variable interest entity (“VIE”) and that Piedmont has a controlling interest in Piedmont Washington Properties, Inc. Accordingly, Piedmont’s consolidated financial statements include the accounts of Piedmont Washington Properties, Inc.

In addition, Piedmont owns interests in five properties through its ownership in three unconsolidated joint venture partnerships. Management has evaluated these joint ventures and determined that these entities are not VIEs. Although Piedmont is the majority equity participant in certain of these joint ventures, Piedmont does not have a controlling voting interest in any of them; however, Piedmont does exercise significant influence. As a result, the accounts of these joint ventures are not consolidated; but rather accounted for using the equity method of accounting in Piedmont’s consolidated financial statements.

Please refer to Note 7 for a summary of Piedmont’s interests in and consolidation treatment of its various VIEs as of December 31, 2012.

All inter-company balances and transactions have been eliminated upon consolidation.

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

Use of Estimates

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

Real Estate Assets

Real estate assets are stated at cost, as adjusted for any impairment, less accumulated depreciation. Amounts capitalized to real estate assets consist of the cost of acquisition or construction, any tenant improvements or major improvements, and betterments that extend the useful life of the related asset. All repairs and maintenance are expensed as incurred. Additionally, Piedmont capitalizes interest while the development of a real estate asset is in progress; however, no such interest was capitalized during the three years ended December 31, 2012.

Piedmont’s real estate assets are depreciated or amortized using the straight-line method over the following useful lives:

Buildings	40 years
Building improvements	5-25 years
Land improvements	20-25 years
Tenant improvements	Shorter of economic life or lease term
Furniture, fixtures, and equipment	3-5 years
Intangible lease assets	Lease term

Piedmont continually monitors events and changes in circumstances that could indicate that the carrying amounts of the real estate and related intangible assets of both operating properties and properties under construction in which Piedmont has an ownership interest, either directly or through investments in joint ventures, may not be recoverable. When indicators of potential impairment are present for wholly-owned properties, management assesses whether the respective carrying values will be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition for assets held for use, or with the estimated fair values, less costs to sell, for assets held for sale. Piedmont generally considers assets to be held for sale at the point at which a sale contract is executed and earnest money has become non-refundable. In the event that the expected undiscounted future cash flows for assets held for use or the estimated fair value, less costs to sell, for assets held for sale do not exceed the respective asset carrying value, management adjusts such assets to the respective estimated fair values and recognizes an impairment loss. Estimated fair values are calculated based on the following information, depending upon availability, in order of preference: (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of undiscounted cash flows, including estimated sales value (which is based on key assumptions such as estimated market rents, lease-up periods, estimated lease terms, and capitalization and discount rates).

For properties owned as part of an investment in unconsolidated joint ventures, Piedmont assesses the fair value of its investment as compared to its carrying amount. If Piedmont determines that the carrying value is greater than the fair value at any measurement date, Piedmont must also determine if such a difference is temporary in nature. Value fluctuations which are “other than temporary” in nature are then recorded to adjust the carrying value to the fair value amount.

Allocation of Purchase Price of Acquired Assets

Upon the acquisition of real properties, Piedmont allocates the purchase price of properties to acquired tangible assets, consisting of land and building, and identified intangible assets and liabilities, consisting of the value of above-market and below-market leases and the value of in-place leases, based in each case on their estimated fair values.

The fair values of the tangible assets of an acquired property (which includes land and building) are determined by valuing the property as if it were vacant, and the “as-if-vacant” value is then allocated to land and building based on management’s determination of the relative fair value of these assets. Management determines the as-if-vacant fair value of a property using methods similar to those used by independent appraisers. Factors considered by management in performing these analyses include an estimate of carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases, including leasing commissions and other related costs. In estimating carrying costs, management includes real estate taxes, insurance, and other operating expenses during the expected lease-up periods based on current market conditions.

The fair values of above-market and below-market in-place leases are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) management’s estimate of market rates for the corresponding in-place leases, measured over a period equal to the remaining terms of the leases, taking into consideration the probability of renewals for any below-market leases. The capitalized above-market and below-market lease values are recorded as intangible lease assets or liabilities and amortized as an adjustment to rental revenues over the remaining terms of the respective leases.

The fair values of in-place leases include direct costs associated with obtaining a new tenant, opportunity costs associated with lost rentals that are avoided by acquiring an in-place lease, and tenant relationships. Direct costs associated with obtaining a new tenant include commissions, tenant improvements, and other direct costs and are estimated based on management’s consideration of current market costs to execute a similar lease. These direct lease origination costs are included in deferred lease costs in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases. The value of opportunity costs is calculated using the contractual amounts to be paid pursuant to the in-place leases over a market absorption period for a similar lease. These lease intangibles are included in intangible lease assets in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases.

Gross intangible assets and liabilities as of December 31, 2012 and 2011, respectively, are as follows (in thousands):

	December 31, 2012		December 31, 2011
Intangible Lease Assets:
Above-Market In-Place Lease Assets	$	21,468	$	33,707
Absorption Period Costs	$	101,217	$	164,960
Intangible Lease Origination Costs (included in Deferred Lease Costs)	$	116,995	$	146,375
Intangible Lease Liabilities (Below-Market In-Place Leases)	$	81,736	$	113,018

For the years ended December 31, 2012, 2011, and 2010, respectively, Piedmont recognized amortization of intangible lease costs as follows (in thousands):

	2012		2011		2010
Amortization expense related to Intangible Lease Origination Costs and Absorption Period Costs	$	36,151	$	48,013	$	34,660
Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues	$	5,678	$	7,065	$	5,788

Net intangible assets and liabilities as of December 31, 2012 will be amortized as follows (in thousands):

	Intangible Lease Assets						Liabilities
	Above-Market In-place Lease Assets		Absorption Period Costs		Intangible Lease Origination Costs		Below-Market In-place Lease Liabilities
For the year ending December 31:
2013	$	1,772	$	8,292	$	9,606	$	6,192
2014	1,581		6,897		8,180		5,280
2015	1,480		6,545		7,543		4,769
2016	1,418		6,152		7,124		4,718
2017	770		5,502		6,820		4,685
Thereafter	324		14,012		19,863		15,161
	$	7,345	$	47,400	$	59,136	$	40,805
Weighted-Average Amortization Period (in years)	5		8		8		8

Investments in Unconsolidated Joint Ventures

Although Piedmont is the majority equity participant in certain unconsolidated joint ventures, Piedmont does not have a controlling voting interest in any of the unconsolidated joint ventures. Piedmont does, however, exercise significant influence over those joint ventures. Accordingly, Piedmont’s investments in unconsolidated joint ventures are recorded using the equity method of accounting, whereby original investments are recorded at cost and subsequently adjusted for contributions, distributions, and net income/(loss) attributable to such joint ventures. Pursuant to the terms of the unconsolidated joint venture agreements, all income and distributions are allocated to the joint venture partners in accordance with their respective ownership interests. Distributions of net cash from operations are generally distributed to the joint venture partners on a quarterly basis, and are classified as cash inflows from operating activities, as they are presumed to be returns on Piedmont’s investment in the respective joint venture. Proceeds received as the result of a sale of an asset from an unconsolidated joint venture are considered a return of Piedmont’s investment in the joint venture and classified as cash inflows from investing activities.

Cash and Cash Equivalents

Piedmont considers all highly-liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash equivalents include cash and short-term investments. Short-term investments are stated at cost, which approximates fair value, and consist of investments in money market accounts.

Tenant Receivables, net

Tenant receivables are comprised of rental and reimbursement billings due from tenants and the cumulative amount of future adjustments necessary to present rental income on a straight-line basis. Tenant receivables are recorded at the original amount earned, less an allowance for any doubtful accounts, which approximates fair value. Management assesses the collectibility of tenant receivables on an ongoing basis and provides for allowances as such balances, or portions thereof, become uncollectible. Piedmont adjusted the allowance for doubtful accounts by recording (recoveries of)/provisions for bad debts of approximately $0, ($0.4) million, and $0.8 million for the years ended December 31, 2012, 2011, and 2010, respectively, which are included in general and administrative expenses in the accompanying consolidated statements of income.

Due from Unconsolidated Joint Ventures

Due from unconsolidated joint ventures represents operating distributions due to Piedmont from its investments in unconsolidated joint ventures which have been declared but not received as of period end.

Restricted Cash and Escrows

Restricted cash and escrows principally relate to the following types of items:

• escrow accounts held by lenders to pay future real estate taxes, insurance, debt service, and tenant improvements;

• net sales proceeds from property sales held by qualified intermediary for potential Section 1031 exchange;

• earnest money paid in connection with future acquisitions; and

• security and utility deposits paid by tenants per the terms of their respective leases.

Restricted cash and escrows are generally reclassified to other asset or liability accounts upon being used to purchase assets, satisfy obligations, or settle tenant obligations.

Prepaid Expenses and Other Assets

Prepaid expenses and other assets are primarily comprised of the following items:

• prepaid property taxes, insurance and operating costs;

• receivables which are unrelated to tenants, for example, insurance proceeds receivable from insurers related to casualty losses; and

• equipment, furniture and fixtures, and tenant improvements for Piedmont’s corporate office space, net of accumulated depreciation.

Prepaid expenses and other assets will be expensed as utilized or reclassified to other asset or equity accounts upon being put into service in future periods. Balances without a future economic benefit are expensed as they are identified.

Goodwill

Goodwill is the excess of cost of an acquired entity over the amounts specifically assigned to assets acquired and liabilities assumed in purchase accounting for business combinations. Piedmont tests the carrying value of its goodwill for impairment on an annual basis, or on an interim basis if an event occurs or circumstances change that would indicate the carrying amount may be impaired. Such interim circumstances may include, but are not limited to, significant adverse changes in legal factors or in the general business climate, adverse action or assessment by a regulator, unanticipated competition, the loss of key personnel, or persistent declines in an entity’s stock price below carrying value of the entity. In accordance with GAAP, Piedmont has the option, should it choose to do so, to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, Piedmont concludes that the estimated fair value is greater than the carrying amount, then performing a further two-step impairment test is unnecessary. However, if Piedmont chooses to forgo the availability of the qualitative analysis, the test prescribed by authoritative accounting guidance is a two-step test. The first step involves comparing the estimated fair value of the entity to its carrying value, including goodwill. Fair value is determined by adjusting the trading price of the stock for various factors including, but not limited to: (i) liquidity or transferability considerations, (ii) control premiums, and/or (iii) fully distributed premiums, if necessary, multiplied by the common shares outstanding. If such calculated fair value exceeds the carrying value, no further procedures or analysis is required. However, if the carrying value exceeds the calculated fair value, goodwill is potentially impaired and step two of the analysis would be required. Step two of the test involves calculating the implied fair value of goodwill by deducting the fair value of all tangible and intangible net assets of the entity from the entity’s fair value calculated in step one of the test. If the implied value of the goodwill (the remainder left after deducting the fair values of the entity from its calculated overall fair value in step one of the test) is less than the carrying value of goodwill, an impairment loss would be recognized.

Interest Rate Derivatives

Piedmont periodically enters into interest rate derivative agreements to hedge its exposure to changing interest rates. As required by GAAP, Piedmont records all derivatives on the balance sheet at fair value. Piedmont reassesses the effectiveness of its derivatives designated as cash flow hedges on a regular basis to determine if they continue to be highly effective and also to determine if the forecasted transactions remain highly probable. Currently, Piedmont does not use derivatives for trading or speculative purposes.

The changes in fair value of interest rate swap agreements designated as effective cash flow hedges are recorded in other comprehensive income (“OCI”), and subsequently reclassified to earnings when the hedged transactions occur. Changes in the fair values of derivatives designated as cash flow hedges that do not qualify for hedge accounting treatment, if any, would be recorded as gain/(loss) on interest rate swap in the consolidated statements of income. The fair value of the interest rate derivative agreement is recorded as interest rate derivative asset or as interest rate derivative liability in the accompanying consolidated balance sheets. Amounts received or paid under interest rate derivative agreements are recorded as interest expense in the consolidated income statements as incurred. All of Piedmont's interest rate derivative agreements as of December 31, 2012 are designated as cash flow hedges.

Deferred Financing Costs

Deferred financing costs are comprised of costs incurred in connection with securing financing from third-party lenders and are capitalized and amortized to interest expense on a straight-line basis (which approximates the effective interest rate method) over the terms of the related financing arrangements. Piedmont recognized amortization of deferred financing costs for the years ended December 31, 2012, 2011, and 2010 of approximately $2.6 million, $3.2 million, and $2.6 million, respectively, which is included in interest expense in the accompanying consolidated statements of income.

Deferred Lease Costs

Deferred lease costs are comprised of costs and incentives incurred to acquire operating leases, including intangible lease origination costs and direct payroll costs incurred related to negotiating and executing specific leases, and are capitalized and amortized on a straight-line basis over the terms of the related underlying leases. No such internal leasing costs were capitalized for the years ended December 31, 2012, 2011, or 2010. Amortization of deferred leasing costs is reflected in the accompanying consolidated statements of income as follows.

• Piedmont amortized deferred lease costs of approximately $29.8 million, $30.0 million, and $26.8 million for the years ended December 31, 2012, 2011, and 2010, respectively, of which approximately $1.6 million, $1.3 million, and $0.7 million are related to the amortization of deferred common area maintenance costs which are recorded as property operating costs in the accompanying consolidated statements of income. The remaining amortization of deferred lease costs are recorded as amortization expense.

• Piedmont recognized amortization of lease incentives classified as deferred lease costs of $2.5 million, $3.7 million, and $3.4 million, which was recorded as an adjustment to rental income for the years ended December 31, 2012, 2011, and 2010, respectively.

Upon receiving notification of a tenant’s intention to terminate a lease, unamortized deferred lease costs are adjusted to net realizable value through the consolidated statement of income.

Line of Credit and Notes Payable

Certain mortgage notes included in line of credit and notes payable in the accompanying consolidated balance sheets were assumed upon the acquisition of real properties. When debt is assumed, Piedmont adjusts the loan to fair value with a corresponding adjustment to building. The fair value adjustment is amortized to interest expense over the term of the loan using the effective interest method. Amortization of such fair value adjustments was approximately $0, $1.4 million, and $0 for the years ended December 31, 2012, 2011, and 2010, respectively.

Deferred income

Deferred income is primarily comprised of the following items:

• prepaid rent from tenants; and

• tenant reimbursements related to operating expense or property tax expenses which may be due to tenants as part of an annual operating expense reconciliation.

Deferred income related to prepaid rents from tenants will be recognized as income in the period it is earned. Amounts related to operating expense reconciliations or property tax expense are relieved when the tenant's reconciliation is completed in accordance with the underlying lease, and payment is issued to the tenant.

Shares-in-trust

To date, Piedmont has not issued any shares-in-trust; however, under Piedmont’s charter, it has authority to issue a total of 150,000,000 shares-in-trust, which would be issued only in the event that there is a purported transfer of, or other change in or affecting the ownership of, Piedmont’s capital stock that would result in a violation of the ownership limits that are included in Piedmont’s charter to protect its REIT status.

Preferred Stock

To date, Piedmont has not issued any shares of preferred stock; however, Piedmont is authorized to issue up to 100,000,000 shares of one or more classes or series of preferred stock. Piedmont’s board of directors may determine the relative rights, preferences, and privileges of any class or series of preferred stock that may be issued, and can be more beneficial than the rights, preferences, and privileges attributable to Piedmont’s common stock.

Common Stock

Under Piedmont’s charter, it has authority to issue a total of 750,000,000 shares of common stock with a par value of $0.01 per share. Each share of common stock is entitled to one vote and participates in distributions equally. The board of directors of Piedmont authorized the repurchase and retirement of up to $300 million of Piedmont's common stock through November 2013. Piedmont may repurchase the shares from time to time, in accordance with applicable securities laws, in the open market or in privately negotiated transactions. Repurchases will depend upon market conditions and other factors, and repurchases may be commenced or suspended from time to time in Piedmont's discretion, without prior notice. As of December 31, 2012, approximately $208.0 million is available for share repurchases through November 2013.

Dividends

As a REIT, Piedmont is required by the Internal Revenue Code of 1986, as amended (the “Code”), to make distributions to stockholders each taxable year equal to at least 90% of its taxable income, computed without regard to the dividends-paid deduction and by excluding net capital gains attributable to stockholders (“REIT taxable income”). Piedmont sponsors a dividend reinvestment plan ("DRP") pursuant to which common stockholders may elect (if their brokerage agreements allow) to reinvest an amount equal to the dividends declared on their common shares into additional shares of Piedmont’s common stock in lieu of receiving cash dividends. Under the DRP, Piedmont has the option to either issue shares purchased in the open market or issue shares directly from Piedmont's authorized but unissued shares, in both cases at a 2% discount for the stockholder. Such election takes place at the settlement of each quarterly dividend in which there are participants in the DRP, and may change from quarter to quarter based on management's judgment of the best use of proceeds for Piedmont.

Noncontrolling Interest

Noncontrolling interest represents the equity interests of consolidated entities that are not owned by Piedmont. Noncontrolling interest is adjusted for contributions, distributions, and earnings (loss) attributable to the noncontrolling interest partners of the consolidated joint ventures. All earnings and distributions are allocated to the partners of the consolidated joint ventures in accordance with their respective partnership agreements. Earnings allocated to such noncontrolling interest partners are recorded as income attributable to noncontrolling interest in the accompanying consolidated statements of income.

Revenue Recognition

All leases of real estate assets held by Piedmont are classified as operating leases, and the related base rental income is generally recognized on a straight-line basis over the terms of the respective leases. Tenant reimbursements are recognized as revenue in the period that the related operating cost is incurred. Rents and tenant reimbursements collected in advance are recorded as deferred income in the accompanying consolidated balance sheets. Other rental income, consisting primarily of lease termination fees, is recognized once Piedmont has satisfied all obligations under the related lease or lease termination agreement.

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

Stock-based Compensation

Piedmont has issued stock-based compensation in the form of restricted stock to its employees and directors. For employees, such compensation has been issued pursuant to Piedmont's Long-term Incentive Compensation ("LTIC") program. The LTIC program is comprised of an annual restricted stock grant component and a multi-year performance share component. Awards granted pursuant to the annual restricted stock component are considered equity awards and expensed straight-line over the vesting period, with issuances recorded as a reduction to additional paid in capital. Awards granted pursuant to the performance share component are considered liability awards and are expensed over the service period, with issuances recorded as a reduction to accrued expense. The compensation expense recognized related to both of these award types is recorded as property operating costs for those employees whose job is related to property operation and as general and administrative expense for all other employees and directors in the accompanying consolidated statements of income.

Legal Fees and Related Insurance Recoveries

Piedmont recognizes legal expenses in the period in which services are rendered as a component of general and administrative expense or as property operating costs for legal expenses attributable to operating properties. Insurance reimbursements related to ongoing legal matters are recorded as a reduction of legal expense in the period that the insurance company definitively notifies Piedmont of its intent to issue payment.

Litigation Settlement Expense and Related Insurance Recoveries

During the year ended December 31, 2012, Piedmont reached an agreement in principle to settle two separate securities class action lawsuits (See Note 10). As a result of the agreements to settle, Piedmont recorded a $7.5 million charge representing the total of both proposed settlements in its statements of income for the year ended December 31, 2012. Any future insurance recoveries related to these agreements, if applicable, will be recognized as income in the period that the insurance company definitively notifies Piedmont of its intent to issue payment.

Net Casualty Loss/(Gain)

From time to time, certain of our assets may be damaged or destroyed by natural disasters. Such damages may result in significant expenses related to the destruction of fixed assets or costs to clean, repair, and establish emergency operations at the building or buildings affected by the casualty event. In addition, Piedmont may recognize expenses as a result of issuing rent abatements to tenants for business interruptions caused by the tenants' inability to access the space that they lease from Piedmont. Losses related to the above items are estimated and recorded in the period incurred without regard to whether the loss may be ultimately recoverable under Piedmont's various insurance policies. Any insurance recoveries related to such losses, if applicable, are recorded as income in the period receipt is deemed probable. Insurance recoveries in excess of losses recognized or related to business interruption are recorded as income in the period that the insurance company definitively notifies Piedmont of its intent to issue payment. Casualty losses are presented net of insurance recovery income recorded during the period. During the year ended December 31, 2012, substantially all of the net casualty loss recorded related to losses incurred in Piedmont's New York/New Jersey portfolio as a result of Hurricane Sandy which occurred in October 2012.

Net Income Available to Common Stockholders Per Share

Net income per share-basic is calculated as net income available to common stockholders divided by the weighted average number of common shares outstanding during the period. Net income per share-diluted is calculated as net income available to common stockholders divided by the diluted weighted average number of common shares outstanding during the period, including the dilutive effect of nonvested restricted stock. The dilutive effect of nonvested restricted stock is calculated using the treasury stock method to determine the number of additional common shares that would become outstanding if the remaining unvested restricted stock awards vested. Outstanding stock options have been excluded from the diluted earnings per share calculation, as their impact would be anti-dilutive.

Income Taxes

Piedmont has elected to be taxed as a REIT under the Code, and has operated as such, beginning with its taxable year ended December 31, 1998. To qualify as a REIT, Piedmont must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its annual REIT taxable income. As a REIT, Piedmont is generally not subject to federal income taxes. Accordingly, neither a provision nor a benefit for federal income taxes has been made in the accompanying consolidated financial statements. Piedmont is subject to certain state and local taxes related to the operations of properties in certain locations, which have been provided for in the financial statements. Additionally, Piedmont conducts certain operations through its taxable REIT subsidiary, Piedmont Office Holdings, Inc. These operations resulted in estimated tax payments of approximately $8.5 thousand for the year ended December 31, 2012, which is recorded in the accompanying financial statements as general and administrative costs.

Reclassifications

Certain prior period amounts have been reclassified to conform to the current period financial statement presentation. The reclassifications relate to the required presentation of income from discontinued operations for the properties sold during the years ended December 31, 2012, 2011, and 2010. Please refer to Note 14 for further details. All such reclassifications do not affect net income attributable to Piedmont as presented in previous years.

Recent Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board issued Accounting Standards Update 2013-02, Comprehensive Income Topic Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income ("ASU 2013-02"). ASU 2013-02 requires an entity to disclose information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to disclose significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income if the amount reclassified to net income in its entirety in the same reporting period is required under GAAP. For amounts that are not required under GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under GAAP that provide additional detail about those amounts. ASU 2013-02 is effective for Piedmont for the interim period beginning January 1, 2013. The adoption of ASU 2013-02 is not expected to have a material impact on Piedmont's financial statements or disclosures.

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Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of metropolitan areas	17
Operating Leases, Future Minimum Payments Receivable [Abstract]
2013	377,746
2014	349,565
2015	346,084
2016	310,798
2017	290,158
Thereafter	1,384,133
Total	3,058,484
Geographic Concentration Risk [Member] | Chicago [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	23.10%
Geographic Concentration Risk [Member] | DISTRICT OF COLUMBIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	22.00%
Geographic Concentration Risk [Member] | NEW YORK
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	14.60%
Customer Concentration Risk [Member] | Federal Governmental Agencies [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	13.30%

XML

Schedule III - Real Estate Assets and Accumulated Depreciation

12 Months Ended

Dec. 31, 2012

Real Estate and Accumulated Depreciation Disclosure [Abstract]

Schedule III - Real Estate Assets and Accumulated Depreciation

Piedmont Office Realty Trust, Inc.

Schedule III - Real Estate and Accumulated Depreciation

December 31, 2012

(dollars in thousands)

					Initial Cost					Gross Amount at Which Carried at December 31, 2012
Description	Location	Ownership Percentage		Encumbrances	Land	Buildings and Improvements	Total	Costs Capitalized Subsequent to Acquisition		Land	Buildings and Improvements	Total	Accumulated Depreciation and Amortization	Date of Construction	Date Acquired	Life on which Depreciation and Amortization is Computed (in years) (f)
3900 DALLAS PARKWAY	Plano, TX	100	%	None	1,456	20,377	21,837	3,047		1,517	23,367	24,884	8,826	1999	12/21/1999	0	-	40
RIVER CORPORATE CENTER	Tempe, AZ	100	%	(a)	—	16,036	16,036	7,309		—	23,345	23,345	6,291	1998	3/29/2000	0	-	40
8700 SOUTH PRICE ROAD	Tempe, AZ	100	%	(a)	—	13,272	13,272	551		—	13,823	13,823	4,902	2000	6/12/2000	0	-	40
1441 WEST LONG LAKE ROAD	Troy, MI	100	%	None	2,160	16,776	18,936	(6,760	)	1,202	10,974	12,176	6,766	1999	6/29/2000	0	-	40
1111 DURHAM AVENUE	South Plainfield, NJ	100	%	None	9,653	20,495	30,148	(11,547	)	3,728	14,873	18,601	8,378	1975	11/1/2000	0	-	40
1430 ENCLAVE PARKWAY	Houston, TX	100	%	32,100	7,100	37,915	45,015	3,700		5,506	43,209	48,715	14,686	1994	12/21/2000	0	-	40
CRESCENT RIDGE II	Minnetonka, MN	100	%	None	7,700	45,154	52,854	7,954		8,021	52,787	60,808	19,404	2000	12/21/2000	0	-	40
1200 CROWN COLONY DRIVE (c)	Quincy, MA	100	%	20,200	11,042	40,666	51,708	1,970		11,042	42,636	53,678	13,020	1990	7/30/2001	0	-	40
5601 HIATUS ROAD	Tamarac, FL	100	%	None	3,642	10,404	14,046	1,722		3,642	12,126	15,768	3,404	2001	12/21/2001	0	-	40
WINDY POINT I	Schaumburg, IL	100	%	23,400	4,537	31,847	36,384	2,341		4,537	34,188	38,725	10,157	1999	12/31/2001	0	-	40
WINDY POINT II	Schaumburg, IL	100	%	40,300	3,746	55,026	58,772	1,096		3,746	56,122	59,868	16,575	2001	12/31/2001	0	-	40
SARASOTA COMMERCE CENTER II	Sarasota, FL	100	%	None	1,767	20,533	22,300	2,249		2,203	22,346	24,549	6,732	1999	1/11/2002	0	-	40
11695 JOHNS CREEK PARKWAY	Johns Creek, GA	100	%	None	2,080	13,572	15,652	1,648		2,081	15,219	17,300	4,695	2001	3/28/2002	0	-	40
3750 BROOKSIDE PARKWAY	Alpharetta, GA	100	%	None	1,561	14,207	15,768	112		1,561	14,319	15,880	4,189	2001	4/18/2002	0	-	40
2001 NW 64th STREET	Ft. Lauderdale, FL	100	%	(a)	—	7,172	7,172	769		—	7,941	7,941	2,177	2001	4/18/2002	0	-	40
90 CENTRAL STREET	Boxborough, MA	100	%	None	3,642	29,497	33,139	2,630		3,642	32,127	35,769	9,799	2001	5/3/2002	0	-	40
DESERT CANYON 300	Phoenix, AZ	100	%	None	2,602	24,333	26,935	100		2,602	24,433	27,035	6,906	2001	6/4/2002	0	-	40
6031 CONNECTION DRIVE	Irving, TX	100	%	None	3,157	43,656	46,813	2,419		3,157	46,075	49,232	12,465	1999	8/15/2002	0	-	40
6021 CONNECTION DRIVE	Irving, TX	100	%	None	3,157	42,662	45,819	1,397		3,157	44,059	47,216	12,756	2000	8/15/2002	0	-	40
6011 CONNECTION DRIVE	Irving, TX	100	%	None	3,157	29,034	32,191	2,586		3,157	31,620	34,777	9,395	1999	8/15/2002	0	-	40
BRAKER POINTE III (c)	Austin, TX	100	%	16,500	6,098	34,492	40,590	1		6,099	34,492	40,591	9,544	2001	8/15/2002	0	-	40
CHANDLER FORUM	Chandler, AZ	100	%	None	2,632	—	2,632	19,917		2,779	19,770	22,549	6,334	2003	9/12/2002	0	-	40

					Initial Cost					Gross Amount at Which Carried at December 31, 2012
Description	Location	Ownership Percentage		Encumbrances	Land	Buildings and Improvements	Total	Costs Capitalized Subsequent to Acquisition		Land	Buildings and Improvements	Total	Accumulated Depreciation and Amortization	Date of Construction	Date Acquired	Life on which Depreciation and Amortization is Computed (in years) (f)
2 GATEHALL DRIVE (c)	Parsippany, NJ	100	%	42,700	9,054	96,722	105,776	33		9,054	96,755	105,809	26,514	1985	9/27/2002	0	-	40
350 SPECTRUM LOOP	Colorado  Springs, CO	100	%	None	2,185	24,964	27,149	(1,894	)	2,186	23,069	25,255	6,313	2001	9/27/2002	0	-	40
5601 HEADQUARTERS DRIVE	Plano, TX	100	%	None	3,153	24,602	27,755	2,663		3,153	27,265	30,418	6,797	2001	9/27/2002	0	-	40
TWO INDEPENDENCE SQUARE (c)	Washington, DC	100	%	105,800	52,711	202,702	255,413	21,374		52,711	224,076	276,787	55,720	1991	11/22/2002	0	-	40
ONE INDEPENDENCE SQUARE (c)	Washington, DC	100	%	57,800	29,765	104,814	134,579	2,770		30,562	106,787	137,349	28,479	1991	11/22/2002	0	-	40
2120 WEST END AVENUE (c)	Nashville, TN	100	%	26,800	4,908	59,011	63,919	6,671		5,100	65,490	70,590	17,776	2000	11/26/2002	0	-	40
800 NORTH BRAND BOULEVARD	Glendale, CA	100	%	None	23,605	136,284	159,889	8,900		23,607	145,182	168,789	39,209	1990	12/20/2002	0	-	40
EASTPOINT I	Mayfield  Heights, OH	100	%	None	1,485	11,064	12,549	423		1,485	11,487	12,972	2,972	2000	1/9/2003	0	-	40
EASTPOINT II	Mayfield Heights, OH	100	%	None	1,235	9,199	10,434	1,895		1,235	11,094	12,329	3,155	2000	1/9/2003	0	-	40
150 WEST JEFFERSON	Detroit, MI	100	%	None	9,759	88,364	98,123	3,846		9,759	92,210	101,969	25,154	1989	3/31/2003	0	-	40
US BANCORP CENTER	Minneapolis, MN	100	%	105,000	11,138	175,629	186,767	7,614		11,138	183,243	194,381	46,382	2000	5/1/2003	0	-	40
AON CENTER	Chicago, IL	100	%	225,000	23,267	472,488	495,755	125,542		23,966	597,331	621,297	143,225	1972	5/9/2003	0	-	40
AUBURN HILLS CORPORATE CENTER	Auburn Hills, MI	100	%	None	1,978	16,570	18,548	(8,159	)	1,591	8,798	10,389	3,763	2001	5/9/2003	0	-	40
11107 SUNSET HILLS ROAD	Reston, VA	100	%	None	2,711	17,890	20,601	1,371		2,711	19,261	21,972	4,901	1985	6/27/2003	0	-	40
11109 SUNSET HILLS ROAD	Reston, VA	100	%	None	1,218	8,038	9,256	(2,338	)	1,218	5,700	6,918	1,490	1984	6/27/2003	0	-	40
9211 CORPORATE BOULEVARD	Rockville, MD	100	%	None	3,019	21,984	25,003	(4,844	)	2,960	17,199	20,159	4,186	1989	7/30/2003	0	-	40
9221 CORPORATE BOULEVARD	Rockville, MD	100	%	None	3,019	21,984	25,003	(4,822	)	2,960	17,221	20,181	4,194	1989	7/30/2003	0	-	40
GLENRIDGE HIGHLANDS TWO	Atlanta, GA	100	%	None	6,662	69,031	75,693	(22,036	)	6,662	46,995	53,657	11,536	2000	8/1/2003	0	-	40
200 BRIDGEWATER CROSSING (c)	Bridgewater, NJ	100	%	40,200	8,182	84,160	92,342	(17,783	)	8,328	66,231	74,559	14,672	2002	8/14/2003	0	-	40
1055 EAST COLORADO BOULEVARD	Pasadena, CA	100	%	29,200	6,495	30,265	36,760	(8,338	)	6,495	21,927	28,422	5,494	2001	8/22/2003	0	-	40
FAIRWAY CENTER II (c)	Brea, CA	100	%	10,700	7,110	15,600	22,710	(2,298	)	7,110	13,302	20,412	3,003	2002	8/29/2003	0	-	40
COPPER RIDGE CENTER	Lyndhurst, NJ	100	%	None	6,974	38,714	45,688	(5,675	)	6,974	33,039	40,013	8,408	1989	9/5/2003	0	-	40

					Initial Cost					Gross Amount at Which Carried at December 31, 2012
Description	Location	Ownership Percentage		Encumbrances	Land	Buildings and Improvements	Total	Costs Capitalized Subsequent to Acquisition		Land	Buildings and Improvements	Total	Accumulated Depreciation and Amortization	Date of Construction	Date Acquired	Life on which Depreciation and Amortization is Computed (in years) (f)
1901 MAIN STREET	Irvine, CA	100	%	None	6,246	36,455	42,701	(5,019	)	6,246	31,436	37,682	8,681	2001	9/17/2003	0	-	40
400 VIRGINIA AVE	Washington, DC	100	%	None	22,146	49,740	71,886	(1,856	)	22,146	47,884	70,030	11,467	1985	11/19/2003	0	-	40
4250 NORTH FAIRFAX DRIVE	Arlington, VA	100	%	45,000	13,636	70,918	84,554	5,098		13,636	76,016	89,652	21,922	1998	11/19/2003	0	-	40
1225 EYE STREET (d)	Washington, DC	50	%	57,600	21,959	47,602	69,561	(2,559	)	21,959	45,043	67,002	11,262	1986	11/19/2003	0	-	40
1201 EYE STREET (e)	Washington, DC	50	%	82,400	31,985	63,139	95,124	(3,133	)	31,985	60,006	91,991	13,985	2001	11/19/2003	0	-	40
1901 MARKET STREET	Philadelphia, PA	100	%	None	13,584	166,683	180,267	137		20,829	159,575	180,404	44,068	1987	12/18/2003	0	-	40
60 BROAD STREET	New York, NY	100	%	None	32,522	168,986	201,508	(5,994	)	60,708	134,806	195,514	33,533	1962	12/31/2003	0	-	40
1414 MASSACHUSETTS AVENUE	Cambridge, MA	100	%	None	4,210	35,821	40,031	1,988		4,365	37,654	42,019	13,114	1873	1/8/2004	0	-	40
ONE BRATTLE SQUARE	Cambridge, MA	100	%	None	6,974	64,940	71,914	(3,814	)	7,113	60,987	68,100	23,204	1991	2/26/2004	0	-	40
600 CORPORATE DRIVE	Lebanon, NJ	100	%	None	3,934	—	3,934	16,281		3,934	16,281	20,215	4,561	2005	3/16/2004	0	-	40
1075 WEST ENTRANCE DRIVE	Auburn Hills,  MI	100	%	None	5,200	22,957	28,157	(313	)	5,207	22,637	27,844	4,694	2001	7/7/2004	0	-	40
3100 CLARENDON BOULEVARD	Arlington, VA	100	%	None	11,700	69,705	81,405	(5,363	)	11,791	64,251	76,042	12,864	1987	12/9/2004	0	-	40
9200 CORPORATE BOULEVARD	Rockville, MD	100	%	None	3,730	16,608	20,338	(1,624	)	3,882	14,832	18,714	2,987	1982	12/29/2004	0	-	40
400 BRIDGEWATER CROSSING (c)	Bridgewater, NJ	100	%	29,300	10,400	71,052	81,452	(8,218	)	10,400	62,834	73,234	15,093	2002	2/17/2006	0	-	40
LAS COLINAS CORPORATE CENTER I	Irving, TX	100	%	17,500	3,912	18,830	22,742	(2,279	)	2,543	17,920	20,463	6,527	1998	8/31/2006	0	-	40
LAS COLINAS CORPORATE CENTER II	Irving, TX	100	%	25,025	4,496	29,881	34,377	(7,083	)	2,543	24,751	27,294	4,591	1998	8/31/2006	0	-	40
TWO PIERCE PLACE	Itasca, IL	100	%	None	4,370	70,632	75,002	1,667		4,370	72,299	76,669	16,258	1991	12/7/2006	0	-	40
2300 CABOT DRIVE	Lisle, IL	100	%	None	4,390	19,549	23,939	(2,849	)	4,390	16,700	21,090	4,640	1998	5/10/2007	0	-	40
PIEDMONT POINTE I	Bethesda, MD	100	%	None	11,200	58,606	69,806	7,339		11,200	65,945	77,145	8,407	2007	11/13/2007	0	-	40
PIEDMONT POINTE II	Bethesda, MD	100	%	None	13,300	70,618	83,918	6,279		13,300	76,897	90,197	8,670	2008	6/25/2008	0	-	40
SUWANEE GATEWAY ONE	Suwanee, GA	100	%	None	1,000	6,875	7,875	78		1,000	6,953	7,953	405	2008	9/28/2010	0	-	40
ONE MERIDIAN CROSSINGS	Richfield, MN	100	%	None	2,919	24,398	27,317	(1	)	2,919	24,397	27,316	1,550	1997	10/1/2010	0	-	40
TWO MERIDIAN CROSSINGS	Richfield, MN	100	%	None	2,661	25,742	28,403	99		2,661	25,841	28,502	1,824	1998	10/1/2010	0	-	40
1200 ENCLAVE PARKWAY	Houston, TX	100	%	None	3,460	15,047	18,507	6,189		3,460	21,236	24,696	949	1999	3/30/2011	0	-	40
500 W. MONROE	Chicago, IL	100	%	140,000	36,990	185,113	222,103	(20,929	)	36,990	164,184	201,174	8,565	1991	3/31/2011	0	-	40
THE DUPREE	Atlanta, GA	100	%	None	4,080	14,310	18,390	55		4,080	14,365	18,445	1,067	1997	4/29/2011	0	-	40
THE MEDICI	Atlanta, GA	100	%	None	1,780	11,510	13,290	728		1,780	12,238	14,018	777	2008	6/7/2011	0	-	40

					Initial Cost									Gross Amount at Which Carried at December 31, 2012
Description	Location	Ownership Percentage		Encumbrances	Land		Buildings and Improvements		Total		Costs Capitalized Subsequent to Acquisition			Land		Buildings and Improvements		Total		Accumulated Depreciation and Amortization		Date of Construction	Date Acquired	Life on which Depreciation and Amortization is Computed (in years) (f)
225 PRESIDENTIAL WAY	Boston, MA	100	%	None	3,626		36,916		40,542		(764		)	3,612		36,166		39,778		2,038		2000	9/13/2011	0	-	40
235 PRESIDENTIAL WAY	Boston, MA	100	%	None	4,154		44,048		48,202		(911		)	4,138		43,153		47,291		2,421		2001	9/13/2011	0	-	40
400 TOWNPARK	Lake Mary, FL	100	%	None	2,570		20,555		23,125		580			2,570		21,135		23,705		1,029		2008	11/10/2011	0	-	40
PIEDMONT POWER, LLC (g)	Bridgewater, NJ	100	%	None	—		79		79		3,079			—		3,158		3,158		—		N/A	12/20/2011	0	-	40
UNDEVELOPED LAND PARCELS (b)	Various	100	%	None	6,021		427		6,448		2,987			9,435		—		9,435		—		N/A	Various			N/A
Total—Consolidated REIT Properties					$	599,677	$	3,834,947	$	4,434,624	$	130,001		$	629,536	$	3,935,093	$	4,564,629	$	951,897

					Initial Cost									Gross Amount at Which Carried at December 31, 2012
Description	Location	Ownership Percentage		Encumbrances	Land		Buildings and Improvements		Total		Costs Capitalized Subsequent to Acquisition			Land		Buildings and Improvements		Total		Accumulated Depreciation and Amortization		Date of Construction	Date Acquired	Life on which Depreciation and Amortization is Computed (in years) (f)
20/20	Leawood, KS	57	%	None	1,696		7,851		9,547		(1,259		)	1,767		6,521		8,288		3,906		1992	7/2/1999	0	-	40
4685 INVESTMENT DRIVE	Troy, MI	55	%	None	2,144		9,984		12,128		2,902			2,233		12,797		15,030		6,029		2000	5/10/2000	0	-	40
5301 MARYLAND WAY	Brentwood, TN	55	%	None	4,300		20,702		25,002		1,360			4,479		21,883		26,362		7,242		1989	5/15/2001	0	-	40
8560 UPLAND DRIVE	Parker, CO	72	%	None	1,954		11,216		13,170		1,084			2,048		12,206		14,254		3,612		2001	12/21/2001	0	-	40
TWO PARK CENTER	Hoffman Estates, IL	72	%	None	600		22,682		23,282		(2,941		)	624		19,717		20,341		5,082		1999	9/19/2003	0	-	40
Total – Unconsolidated JV Properties					$	10,694	$	72,435	$	83,129	$	1,146		$	11,151	$	73,124	$	84,275	$	25,871
Total – All Properties					$	610,371	$	3,907,382	$	4,517,753	$	131,147		$	640,687	$	4,008,217	$	4,648,904	$	977,768

^(a)  Property is owned subject to a long-term ground lease.

^(b)  Undeveloped Land Parcels are not included in Piedmont’s total building count.

^(c)  These properties collateralize the $350 Million Secured Pooled Facility.

^(d)  Piedmont purchased all of the membership interest in 1225 Equity, LLC, which own a 49.5% membership interest in 1225 Eye Street, N.W. Associates, which owns the 1225 Eye Street building. As a result of its ownership of 1225 Equity, LLC, Piedmont owns an approximate 49.5% in the 1225 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.

^(e)  Piedmont purchased all of the membership interest in 1201 Equity, LLC, which own a 49.5% membership interest in 1201 Eye Street, N.W. Associates, which owns the 1201 Eye Street building. As a result of its ownership of 1201 Equity, LLC, Piedmont owns an approximate 49.5% in the 1201 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.

^(f)  Piedmont’s assets are depreciated or amortized using the straight-lined method over the useful lives of the assets by class. Generally, Tenant Improvements are amortized over the shorter of economic life or lease term, and Lease Intangibles are amortized over the lease term. Generally, Building Improvements are depreciated over 5 - 25 years, Land Improvements are depreciated over 20 - 25 years, and Buildings are depreciated over 40 years.

^(g)  Represents solar panels at the 400 Bridgewater Crossing building, which are not included in Piedmont’s total building count.

Piedmont Office Realty Trust, Inc.

Schedule III - Real Estate and Accumulated Depreciation

December 31, 2012

(dollars in thousands)

	2012			2011			2010
Real Estate:
Balance at the beginning of the year	$	4,699,311		$	4,666,188		$	4,681,313
Additions to/improvements of real estate	108,131			440,141			105,282
Assets disposed	(77,768		)	(361,397		)	(72,586		)
Assets impaired	—			—			(8,489		)	(2)
Write-offs of intangible assets(1)	(73,632		)	(35,916		)	—
Write-offs of fully depreciated/amortized assets	(7,138		)	(9,705		)	(39,332		)
Balance at the end of the year	$	4,648,904		$	4,699,311		$	4,666,188
Accumulated Depreciation and Amortization:
Balance at the beginning of the year	$	935,716		$	918,578		$	840,545
Depreciation and amortization expense	139,196			147,440			131,000
Assets disposed	(16,374		)	(84,681		)	(13,519		)
Write-offs of intangible assets(1)	(73,632		)	(35,916		)	—
Write-offs of fully depreciated/amortized assets	(7,138		)	(9,705		)	(39,448		)
Balance at the end of the year	$	977,768		$	935,716		$	918,578

⁽¹⁾  Consists of write-offs of intangible lease assets related to lease restructurings, amendments and terminations.

⁽²⁾  Piedmont recorded an impairment charge against real estate assets of approximately $7.0 million related to the 111 Sylvan Avenue building at the time it was classified as held-for-sale in May 2010. This wholly-owned asset was subsequently sold in December 2010. In addition, the Fund IX, Fund XI, and REIT Joint Venture recorded an impairment loss on real estate assets of approximately $1.4 million during 2010 related to the 360 Interlocken building; however, Piedmont recorded its proporationate share of the charge (approximately $53,000) in the accompanying consolidated statements of income with other such net property operations as equity in income of unconsolidated joint ventures.

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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares

The following table reconciles the denominator for the basic and diluted earnings per share computations shown on the consolidated statements of operations for the years ended December 2012, 2011, and 2010 (in thousands):

	2012	2011	2010
Weighted-average common shares—basic	170,312	172,765	170,753
Plus incremental weighted-average shares resulting from the assumed conversion of time-vested restricted stock awards	129	216	214
Weighted-average common shares—diluted	170,441	172,981	170,967

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Earnings Per Share

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

There are no adjustments to “Net income attributable to Piedmont” or “Income from continuing operations” for the diluted earnings per share computations.

Net income per share-basic is calculated as net income available to common stockholders divided by the weighted average number of common shares outstanding during the period. Net income per share-diluted is calculated as net income available to common stockholders divided by the diluted weighted average number of common shares outstanding during the period, including the dilutive effect of nonvested restricted stock. The dilutive effect of nonvested restricted stock is calculated using the treasury stock method to determine the number of additional common shares that would become outstanding if the remaining unvested restricted stock awards vested. Outstanding stock options have been excluded from the diluted earnings per share calculation, as their impact would be anti-dilutive. The following table reconciles the denominator for the basic and diluted earnings per share computations shown on the consolidated statements of operations for the years ended December 2012, 2011, and 2010 (in thousands):

	2012	2011	2010
Weighted-average common shares—basic	170,312	172,765	170,753
Plus incremental weighted-average shares resulting from the assumed conversion of time-vested restricted stock awards	129	216	214
Weighted-average common shares—diluted	170,441	172,981	170,967