Exhibit 31.1

Certification by the Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities

Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, David Simon, certify that:

1.I have reviewed this Annual Report on Form 10-K/A of Simon Property Group, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Date: March 17, 2006
	/s/ David Simon
	David Simon
	Chief Executive Officer

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