-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 J5LszghmhMgVxsyZ7QOpB/VwDTXNJhecKK5lcJiCPH6jTlTiRuyL09UprVXrY7im
 p7nTXaWbgdqTLBUoCOxKUw==

<SEC-DOCUMENT>0001179110-06-001027.txt : 20060109
<SEC-HEADER>0001179110-06-001027.hdr.sgml : 20060109
<ACCEPTANCE-DATETIME>20060109185254
ACCESSION NUMBER:		0001179110-06-001027
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060105
FILED AS OF DATE:		20060109
DATE AS OF CHANGE:		20060109

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MACK WILLIAM L
		CENTRAL INDEX KEY:			0001051774
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13274
		FILM NUMBER:		06520415

	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

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
</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>2006-01-05</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001051774</rptOwnerCik>
            <rptOwnerName>MACK WILLIAM L</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>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Units of Limited Partnership Interest</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-12-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>G</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionTimeliness>
                <value>E</value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>50000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>1988-08-08</value>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>1988-08-08</value>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>50000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>175693</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Units of Limited Partnership Interest</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-12-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>G</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionTimeliness>
                <value>E</value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>50000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>1988-08-08</value>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>1988-08-08</value>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>50000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>50000</value>
                    <footnoteId id="F5"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Charitable Foundation</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Phantom Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
                <footnoteId id="F6"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-01-05</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>253.667</value>
                    <footnoteId id="F7"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>43.43</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>1988-08-08</value>
                <footnoteId id="F8"/>
            </exerciseDate>
            <expirationDate>
                <value>1988-08-08</value>
                <footnoteId id="F8"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>253.667</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5663.108</value>
                    <footnoteId id="F9"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Units of Limited Partnership Interest (&quot;Common Units&quot;) of Mack-Cali Realty, L.P. (the &quot;Operating Partnership&quot;) 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 Mack-Cali Realty Corporation (the &quot;Corporation&quot;) 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="F2">On December 15, 2005, the reporting person donated 50,000 Common Units to the William &amp; Phyllis Mack Foundation, Inc., a charitable foundation (the &quot;Foundation&quot;), of which the reporting person is a trustee.  Pursuant to Rule 13d-4 under the Exchange Act, the reporting person disclaims beneficial ownership of all of the Common Units held by the Foundation.</footnote>
        <footnote id="F3">The right to convert Common Units is not subject to expiration.</footnote>
        <footnote id="F4">Excludes the following securities directly beneficially owned by the reporting person: (i) 5,663.108 phantom stock units; and (ii) options to purchase 28,000 shares of Common Stock.  Also excludes the following securities indirectly beneficially owned by the reporting person: (i) 2,221,420.73 Common Units held by a grantor retained annuity trust (the &quot;GRAT&quot;); (ii) 50,000 Common Units held by the Foundation; and (iii) 833,769.02 Common Units held by other trusts (the &quot;Trusts&quot;).  Pursuant to Rule 13d-4, the reporting person disclaims beneficial ownership of all securities held by the GRAT, the Foundation and the Trusts.</footnote>
        <footnote id="F5">Excludes the following securities directly beneficially owned by the reporting person: (i) 175,693 Common Units; (ii) 5,663.108 phantom stock units; and (iii) options to purchase 28,000 shares of Common Stock.  Also excludes the following securities indirectly beneficially owned by the reporting person: (i) 2,221,420.73 Common Units held by a grantor retained annuity trust (the &quot;GRAT&quot;); and (ii) 833,769.02 Common Units held by other trusts (the &quot;Trusts&quot;).  Pursuant to Rule 13d-4, the reporting person disclaims beneficial ownership of all securities held by the GRAT, the Foundation and the Trusts.</footnote>
        <footnote id="F6">The phantom stock units convert to Common Stock on a one-for-one basis.</footnote>
        <footnote id="F7">The number of phantom stock units awarded is comprised of a quarterly director's fee earned and a quarterly dividend credited on cumulative phantom stock units under the Mack-Cali Realty Corporation Deferred Compensation Plan for Directors.</footnote>
        <footnote id="F8">The phantom stock units were accrued under the Mack-Cali Realty Corporation Deferred Compensation Plan for Directors and are to be settled 100% in Common Stock upon the termination of the reporting person's service on the Board of Directors of the Corporation or upon a change in control of the Corporation.</footnote>
        <footnote id="F9">Excludes the following securities directly beneficially owned by the reporting person: (i) 175,693 Common Units; and (ii) options to purchase 28,000 shares of Common Stock. Also excludes the following securities indirectly beneficially owned by the reporting person: (i) 2,221,420.73 Common Units held by the GRAT; (ii) 50,000 Common Units held by the Foundation; and (iii) 833,769.02 Common Units held by the Trusts.  Pursuant to Rule 13d-4, the reporting person disclaims beneficial ownership of all securities held by the GRAT, the Foundation and the Trusts.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ William L. Mack</signatureName>
        <signatureDate>2006-01-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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