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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001179110-05-012358.txt : 20050615
<SEC-HEADER>0001179110-05-012358.hdr.sgml : 20050614
<ACCEPTANCE-DATETIME>20050615164818
ACCESSION NUMBER:		0001179110-05-012358
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050613
FILED AS OF DATE:		20050615
DATE AS OF CHANGE:		20050615

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MACK CALI REALTY CORP
		CENTRAL INDEX KEY:			0000924901
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		IRS NUMBER:				223305147
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		11 COMMERCE DR
		STREET 2:		1ST FLOOR
		CITY:			CRANFORD
		STATE:			NJ
		ZIP:			07016
		BUSINESS PHONE:		9082728000

	MAIL ADDRESS:	
		STREET 1:		11 COMMERCE DRIVE
		STREET 2:		1ST FLOOR
		CITY:			CRANFORD
		STATE:			NJ
		ZIP:			07016

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CALI REALTY CORP /NEW/
		DATE OF NAME CHANGE:	19960730

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CALI REALTY L P
		DATE OF NAME CHANGE:	19941025

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CALI REALTY CORP
		DATE OF NAME CHANGE:	19940608

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HERSH MITCHELL E
		CENTRAL INDEX KEY:			0001051538

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13274
		FILM NUMBER:		05897981

	BUSINESS ADDRESS:	
		STREET 1:		C/O MACK-CALI REALTY CORP
		STREET 2:		11 COMMERCE DRIVE
		CITY:			CRANFORD
		STATE:			NJ
		ZIP:			07016
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-06-13</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000924901</issuerCik>
        <issuerName>MACK CALI REALTY CORP</issuerName>
        <issuerTradingSymbol>CLI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001051538</rptOwnerCik>
            <rptOwnerName>HERSH MITCHELL E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MACK-CALI REALTY CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>11 COMMERCE DRIVE</rptOwnerStreet2>
            <rptOwnerCity>CRANFORD</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07016</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Series B Preferred Units of Limited Partnership Interest</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>34.65</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-06-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2606</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>1988-08-08</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>1988-08-08</value>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Units of Limited Partnership Interest</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>75209.24</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Series B Preferred Units of limited partnership interest (the &quot;Series B Preferred Units&quot;)  in Mack-Cali Realty, L.P. (the &quot;Operating Partnership&quot;), of which Mack-Cali Realty Corporation (the &quot;Corporation&quot;) is the general partner, were redeemed by the Operating Partnership and converted into common units of limited partnership interest in the Operating Partnership (the &quot;Common Units&quot;).</footnote>
        <footnote id="F2">Each Series B Preferred Unit was convertible at the election of (i) the holder at any time and (ii) the Operating Partnership on or after June 13, 2005, into the number of Common Units equal to (x) $1,000, divided by (y) $34.65.  Based upon this conversion formula, each outstanding Series B Preferred Unit was converted into approximately 28.86 Common Units.  The right to convert the Series B Preferred Units was not subject to expiration.</footnote>
        <footnote id="F3">The Common Units are redeemable by the holders of Common Units at their option, subject to certain restrictions, on the basis of one Common Unit for either one share of the Corporation's common stock, par value $0.01 per share (the &quot;Common Stock&quot;), or cash equal to the fair market value of a share of Common Stock at the time of the redemption. The Corporation has the option to deliver shares of Common Stock in exchange for all or any portion of the cash requested.</footnote>
        <footnote id="F4">Excludes 121,424.24 Common Units directly beneficially owned by the reporting person (including the 75,209.24 as converted Common Units that are reported in Table II of this Form 4).</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Mitchell E. Hersh</signatureName>
        <signatureDate>2005-06-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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