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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Fgx19E9fjVu3ISJHW4nTq9k1zxkmpnwezlwR2mLWj17Znk/Vu5SWbFYbEfmp2kM5
 ZqXpalvt+lRjvtmQbGgZ6g==

<SEC-DOCUMENT>0001311761-07-000034.txt : 20070627
<SEC-HEADER>0001311761-07-000034.hdr.sgml : 20070627
<ACCEPTANCE-DATETIME>20070627165352
ACCESSION NUMBER:		0001311761-07-000034
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070621
FILED AS OF DATE:		20070627
DATE AS OF CHANGE:		20070627

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KILROY REALTY CORP
		CENTRAL INDEX KEY:			0001025996
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		IRS NUMBER:				954598246
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		12200 W. OLYMPIC BLVD., SUITE 200
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90064
		BUSINESS PHONE:		3104818400

	MAIL ADDRESS:	
		STREET 1:		12200 W. OLYMPIC BLVD., SUITE 200
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90064

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			INGRAHAM SCOTT S
		CENTRAL INDEX KEY:			0001192157

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-12675
		FILM NUMBER:		07944235

	BUSINESS ADDRESS:	
		STREET 1:		C/O CAMDEN PROPERTY TRUST
		STREET 2:		THREE GREENWAY PLAZA #1300
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77046
		BUSINESS PHONE:		7133542500
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2007-06-21</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001025996</issuerCik>
        <issuerName>KILROY REALTY CORP</issuerName>
        <issuerTradingSymbol>KRC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001192157</rptOwnerCik>
            <rptOwnerName>INGRAHAM SCOTT S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>12200 W. OLYMPIC BOULEVARD</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 200</rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90064</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common stock, par value $0.01 per share</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1000</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Award of restricted stock granted pursuant to the Kilroy Realty 2006 Incentive Award Plan.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Tyler H. Rose as attorney-in-fact for Scott S. Ingraham</signatureName>
        <signatureDate>2007-06-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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