Exhibit 32.1

CERTIFICATION

      Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned, being the Chief Executive Officer of ProLogis (the “Company”), hereby certifies that the Company’s Annual Report on Form 10-K for the annual period ended December 31, 2005 (the “Report”), which accompanies this certification, fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:  /s/ JEFFREY H. SCHWARTZ

Name: Jeffrey H. Schwartz

Title: Chief Executive Officer

Dated: March 14, 2006