Equity Residential (EQR) 10-Q 2018 Q2 Quarterly report

Exhibit 32.4

ERP Operating Limited Partnership

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION906OFTHESARBANES-OXLEYACTOF2002

In connection with the Quarterly Report of ERP Operating Limited Partnership (the “Operating Partnership”) on Form 10-QfortheperiodendingJune 30,2018asfiledwiththeSecuritiesandExchangeCommissiononthedatehereof(the“Report”), I,MarkJ.Parrell,ChiefFinancialOfficerofEquityResidential,generalpartneroftheOperatingPartnership,certify,pursuantto 18U.S.C.§1350,asadoptedpursuantto§906oftheSarbanes-OxleyActof2002,that,tothebestofmyknowledge:

(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 the OperatingPartnership.

/s/ Mark J. Parrell

Mark J. Parrell

Chief Financial Officer

of Registrant’s General Partner

August 2, 2018