Erp Operating LTD Partnership 10-Q 2011 Q1 Quarterly report

Exhibit 32.1

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

     In connection with the Quarterly Report of ERP Operating Limited Partnership (“ERPOP”) on Form 10-Q for the period ending March 31, 2011 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David J. Neithercut, Chief Executive Officer of Equity Residential, general partner of ERPOP, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1)	The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(2)	The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of ERPOP.

/s/ David J. Neithercut  

David J. Neithercut 

Chief Executive Officer
of Registrant’s General Partner
May 5, 2011