Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  LEIBOWITZ REUBEN S
 2. Date of Event Requiring Statement (Month/Day/Year)
05/11/2005		 3. Issuer Name and Ticker or Trading Symbol
SIMON PROPERTY GROUP INC /DE/ [SPG]
(Last)
(First)
(Middle)
466 LEXINGTON AVENUE		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

NEW YORK, NY 10017-3147		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 8,500 (1)
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
6% Convertible Preferred Stock   (2)   (2) Common Stock 23,700 $ 63.857 (3) D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
LEIBOWITZ REUBEN S
466 LEXINGTON AVENUE
NEW YORK, NY 10017-3147		   X      

Signatures

Reuben S. Leibowitz, and his attorney-in-fact, Shelly Doran 06/02/2005
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Includes 1,000 shares (awarded 6/1/05) of 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.
(2) The 6% Convertible Preferred Stock may be converted into Common Stock under the following circumstances: (a) if the 6% Convertible Preferred Stock is called for redemption; (b) if Simon Property Group, Inc. is party to a change of control; or (c) if during any fiscal quarter after the last day of the fiscal quarter during which the 6% Convertible Preferred Stock is issued, and only during such quarter, the closing sale of the Common Stock for at least 20 trading days in a period of 30 consecutive trading days ending on the last trading day of the preceeding fiscal quarter exceeds 125% of the then applicable conversion price on such trading day (initially 125% of $63.857, or $79.82125).
(3) The conversion price is subject to adjustments for certain reasons.

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