Holders of Simon Property Group Series I Preferred Stock May Elect to Convert During 2006 Second Fiscal Quarter

INDIANAPOLIS, March 31 /PRNewswire-FirstCall/ -- Simon Property Group, Inc. (the "Company") (NYSE: SPG) today announced that holders of the Company's Series I 6% Convertible Perpetual Preferred Stock ("Preferred Stock") may elect to convert their shares during the quarter beginning on April 3, 2006 and ending on June 30, 2006 because the closing sale price of the Company's Common Stock exceeded $79.59, or 125% of the applicable conversion price, for at least 20 trading days in a period of 30 consecutive trading days ending on the last trading day of the prior quarter, March 31, 2006. At the current conversion price, each share of Preferred Stock is convertible into 0.7853 shares of Simon Property Group Common Stock.

For further information, holders of the Preferred Stock should contact Mellon Investor Services, LLC, the conversion agent (toll free) at 1-800-957-3110, or their respective banks or brokers. Copies of documents necessary to effect tender of Series B Preferred for conversion may be obtained without charge from the conversion agent.

About Simon Property Group

Simon Property Group, Inc., headquartered in Indianapolis, Indiana, is a real estate investment trust engaged in the ownership, development and management of retail real estate, primarily regional malls, Premium Outlet(R) centers and community/lifestyle centers. The Company's current total market capitalization is approximately $43 billion. Through its subsidiary partnership, it currently owns or has an interest in 286 properties in the United States containing an aggregate of 200 million square feet of gross leasable area in 39 states plus Puerto Rico. Simon also owns interests in 51 European shopping centers in France, Italy, and Poland; 5 Premium Outlet(R) centers in Japan; and one Premium Outlet(R) center in Mexico. Additional Simon Property Group information is available at http://www.simon.com .

SOURCE Simon Property Group, Inc.

CONTACT:
Investors:
Shelly Doran
317-685-7330

Media:
Les Morris
317-263-7711
both of Simon Property Group, Inc.