Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statements (Forms S-3 No. 333-45533, No. 333-39289, No. 333-135503, No. 333-142723, No. 333-141261, No. 333-100631, No. 333-63176, No. 333-80835, No. 333-72961, No. 333-12983, No. 333-06873, No. 33-97680 and No. 33-84974; Forms S-8 No. 333-06869, No. 333-107244, No. 333-83403, No. 333-102609, No. 333-66257 and No. 333-88237; and Forms S-4 No. 333-44576 and No. 333-35873) of Equity Residential and in the related Prospectuses of our reports dated December 21, 2007, with respect to the Statement of Revenue and Certain Expenses of the Florida Portfolio, Berkeley Portfolio, Teresina at Lomas Verdes, Upper West Side Portfolio and Greenwood Properties included in this Current Report on Form 8-K.

	/s/ Ernst & Young LLP
	Ernst & Young LLP

Chicago, Illinois

January 2, 2008

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statements (Form S-3 No. 333-135504 and Forms S-4 No. 333-44576 and No. 333-36053) of ERP Operating Limited Partnership and in the related Prospectuses of our reports dated December 21, 2007, with respect to the Statement of Revenue and Certain Expenses of the Florida Portfolio, Berkeley Portfolio, Teresina at Lomas Verdes, Upper West Side Portfolio and Greenwood Properties included in this Current Report on Form 8-K.

	/s/ Ernst & Young LLP
	Ernst & Young LLP

Chicago, Illinois

January 2, 2008