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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Tb3yi9rnfwP9yKX8TtufA+MfnaZDMXPFsyopukj1CdzNzav8aA7Jy26zX3j9eiwS
 aUnAUNuIzVHaiQaUJ2s2tw==

<SEC-DOCUMENT>0001179110-05-009810.txt : 20050513
<SEC-HEADER>0001179110-05-009810.hdr.sgml : 20050513
<ACCEPTANCE-DATETIME>20050513153415
ACCESSION NUMBER:		0001179110-05-009810
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050511
FILED AS OF DATE:		20050513
DATE AS OF CHANGE:		20050513

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			VAN DEN BERG PIETER S
		CENTRAL INDEX KEY:			0001070944

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14469
		FILM NUMBER:		05828932

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		3130696706

	MAIL ADDRESS:	
		STREET 1:		PGGM KROOSTWEG NOORD 149
		STREET 2:		POSTBUS 117
		CITY:			3700 AC ZEIST NETHER
		STATE:			P7

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIMON PROPERTY GROUP INC /DE/
		CENTRAL INDEX KEY:			0001063761
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		IRS NUMBER:				046268599
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		115 WEST WASHINGTON STREET
		CITY:			INDIANAPOLIS
		STATE:			IN
		ZIP:			46204
		BUSINESS PHONE:		3176361600

	MAIL ADDRESS:	
		STREET 1:		115 WEST WASHINGTON STREET
		STREET 2:		-
		CITY:			INDIANAPOLIS
		STATE:			IN
		ZIP:			46204

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CORPORATE PROPERTY INVESTORS INC
		DATE OF NAME CHANGE:	19980610
</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>2005-05-11</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001063761</issuerCik>
        <issuerName>SIMON PROPERTY GROUP INC /DE/</issuerName>
        <issuerTradingSymbol>SPG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001070944</rptOwnerCik>
            <rptOwnerName>VAN DEN BERG PIETER S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>P.O. BOX 4001</rptOwnerStreet1>
            <rptOwnerStreet2>NL 3700 KA ZEIST</rptOwnerStreet2>
            <rptOwnerCity>ZEIST</rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode>3700</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-05-11</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Non-cash compensation- Award of restricted stock under the Simon Property Group, L.P. 1998 Stock Incentive Plan.  The restricted stock vests over a four-year period.</footnote>
        <footnote id="F2">Mr. van den Berg has assigned the economic benefit of his stock to PGGM, a Dutch pension fund.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Pieter S. van den Berg, and his attorney-in-fact, Shelly Doran</signatureName>
        <signatureDate>2005-05-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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