<SEC-DOCUMENT>0001179110-15-001674.txt : 20150204
<SEC-HEADER>0001179110-15-001674.hdr.sgml : 20150204
<ACCEPTANCE-DATETIME>20150204094822
ACCESSION NUMBER:		0001179110-15-001674
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20150204
FILED AS OF DATE:		20150204
DATE AS OF CHANGE:		20150204

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CORPORATE OFFICE PROPERTIES TRUST
		CENTRAL INDEX KEY:			0000860546
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		IRS NUMBER:				232947217
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		6711 COLUMBIA GATEWAY DRIVE
		STREET 2:		SUITE 300
		CITY:			COLUMBIA
		STATE:			MD
		ZIP:			21046
		BUSINESS PHONE:		4432855400

	MAIL ADDRESS:	
		STREET 1:		6711 COLUMBIA GATEWAY DRIVE
		STREET 2:		SUITE 300
		CITY:			COLUMBIA
		STATE:			MD
		ZIP:			21046

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CORPORATE OFFICE PROPERTIES TRUST INC
		DATE OF NAME CHANGE:	19980105

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ROYALE INVESTMENTS INC
		DATE OF NAME CHANGE:	19930328

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ROYALE REIT INC
		DATE OF NAME CHANGE:	19600201

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Mifsud Anthony
		CENTRAL INDEX KEY:			0001349211

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14023
		FILM NUMBER:		15573801

	MAIL ADDRESS:	
		STREET 1:		621 E PRATT STREET
		STREET 2:		SUITE 300
		CITY:			BALTIMORE
		STATE:			MD
		ZIP:			21202
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 3 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2015-02-04</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000860546</issuerCik>
        <issuerName>CORPORATE OFFICE PROPERTIES TRUST</issuerName>
        <issuerTradingSymbol>OFC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001349211</rptOwnerCik>
            <rptOwnerName>Mifsud Anthony</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6711 COLUMBIA GATEWAY DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>COLUMBIA</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21046</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP and CFO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>16890</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>Karen M. Singer, by Power of Attorney</signatureName>
        <signatureDate>2015-02-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>ex24mifsud.txt
<TEXT>
Anthony Mifsud

LIMITED POWER OF ATTORNEY FOR
SECTION 16 REPORTING OBLIGATIONS
Know all by these presents, that the undersigned hereby makes,
constitutes and appoints each of Lee W. Murray and Karen M.
Singer, each acting individually, as the undersigned's true and
lawful attorney-in-fact, with full power and authority as
hereinafter described on behalf of and in the name, place and
stead of the undersigned to:
(1)     prepare, execute, acknowledge, deliver and file Forms 3,
4, and 5 (including any amendments thereto) with respect to the
securities of CORPORATE OFFICE PROPERTIES TRUST, a Maryland real
estate investment trust, and/or CORPORATE OFFICE PROPERTIES, L.P.,
a Delaware limited partnership (the "Company"), required to be
filed with the United States Securities and Exchange Commission,
any national securities exchanges and the Company pursuant to
Section 16(a) of the Securities Exchange Act of 1934 and the rules
and regulations promulgated thereunder, as amended from time to
time (the "Exchange Act");
(2)     seek or obtain, as the undersigned's representative and on
the undersigned's behalf, information on transactions in the
Company's securities from any third party, including brokers and
employee benefit plan administrators and trustees, and the
undersigned hereby authorizes and approves any such release of
information; and
(3)..... perform any and all other acts which in the discretion of
such attorney-in-fact are necessary or desirable for and on behalf
of the undersigned in connection with the foregoing.
The undersigned acknowledges that:
(1)     this Power of Attorney authorizes, but does not require,
each such attorney-in-fact to act in their discretion on
information provided to such attorney-in-fact without independent
verification of such information;
(2).....any documents prepared and/or executed by either such
attorney-in-fact on behalf of the undersigned pursuant to this
Power of Attorney will be in such form and will contain such
information and disclosure as such attorney-in-fact, in his or her
discretion, deems necessary or desirable;
(3).....neither the Company nor either of such attorneys-in-fact
assumes (i) any liability for the undersigned's responsibility to
comply with the requirement of the Exchange Act, (ii) any
liability of the undersigned for any failure to comply with such
requirements, or (iii) any obligation or liability of the
undersigned for profit disgorgement under Section 16(b) of the
Exchange Act; and
(4).....this Power of Attorney does not relieve the undersigned from
responsibility for compliance with the undersigned's obligations
under the Exchange Act, including without limitation the reporting
requirements under Section 16 of the Exchange Act.
The undersigned hereby gives and grants each of the foregoing
attorneys-in-fact full power and authority to do and perform all
and every act and thing whatsoever requisite, necessary or
appropriate to be done in and about the foregoing matters as fully
to all intents and purposes as the undersigned might or could do
if present, hereby ratifying all that each such attorney-in-fact
of, for and on behalf of the undersigned, shall lawfully do or
cause to be done by virtue of this Limited Power of Attorney.
This Power of Attorney shall remain in full force and effect until
revoked by the undersigned in a signed writing delivered to each
such attorney-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 6th day of January, 2015.
/s/Anthony Mifsud

STATE OF MARYLAND)

COUNTY OF HOWARD                         )
On this 6th day of January, 2015, Anthony Mifsud, personally
appeared before me, and acknowledged that he executed the
foregoing instrument for the purposes therein contained.
IN WITNESS WHEREOF, I have hereunto set my hand and official seal.

Monique Jones
Notary Public

My Commission Expires: 11-21-16
2


</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
