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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001042776-10-000044.txt : 20100526
<SEC-HEADER>0001042776-10-000044.hdr.sgml : 20100526
<ACCEPTANCE-DATETIME>20100526161636
ACCESSION NUMBER:		0001042776-10-000044
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100524
FILED AS OF DATE:		20100526
DATE AS OF CHANGE:		20100526

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Miller Donald A
		CENTRAL INDEX KEY:			0001332249

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34626
		FILM NUMBER:		10859806

	MAIL ADDRESS:	
		STREET 1:		11695 JOHNS CREEK PARKWAY
		STREET 2:		STE 350
		CITY:			JOHNS CREEK
		STATE:			GA
		ZIP:			30097

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Piedmont Office Realty Trust, Inc.
		CENTRAL INDEX KEY:			0001042776
		STANDARD INDUSTRIAL CLASSIFICATION:	OPERATORS OF NONRESIDENTIAL BUILDINGS [6512]
		IRS NUMBER:				582328421
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		11695 JOHNS CREEK PARKWAY
		STREET 2:		STE 350
		CITY:			JOHNS CREEK
		STATE:			GA
		ZIP:			30097
		BUSINESS PHONE:		7704188800

	MAIL ADDRESS:	
		STREET 1:		11695 JOHNS CREEK PARKWAY
		STREET 2:		STE 350
		CITY:			JOHNS CREEK
		STATE:			GA
		ZIP:			30097

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WELLS REAL ESTATE INVESTMENT TRUST INC
		DATE OF NAME CHANGE:	19980515
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-05-24</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001042776</issuerCik>
        <issuerName>Piedmont Office Realty Trust, Inc.</issuerName>
        <issuerTradingSymbol>PDM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001332249</rptOwnerCik>
            <rptOwnerName>Miller Donald A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>11695 JOHNS CREEK PARKWAY</rptOwnerStreet1>
            <rptOwnerStreet2>STE 350</rptOwnerStreet2>
            <rptOwnerCity>JOHNS CREEK</rptOwnerCity>
            <rptOwnerState>GA</rptOwnerState>
            <rptOwnerZipCode>30097</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-05-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>21379</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>140131</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-05-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>80171</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>140131</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-05-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>8508</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>18.71</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>140131</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Of the shares granted, one third of the shares will vest on each of the first, second, and third anniversary of the grant date.  All of the granted shares are subject to previously disclosed lock-up agreements until January 30, 2011.</footnote>
        <footnote id="F2">Of the shares granted, 25% vest on the day of grant and the remaining shares vest ratably on the anniversary date of the grant date over the following three years.  All of the granted shares are subject to previously disclosed lock-up agreements until January 30, 2011.</footnote>
        <footnote id="F3">In connection with the vesting of 20,043 shares of deferred stock on May 24, 2010, 8,508 shares were delivered to the Company to satisfy tax withholding obligations, in accordance with the Company's 2007 Omnibus Incentive Plan.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Donald A. Miller, CFA</signatureName>
        <signatureDate>2010-05-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----