Extra Space Storage (EXR) 10-K 2015 FY Annual report

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THESARBANES-OXLEY ACT OF 2002

I, Spencer F. Kirk, Chief Executive Officer of Extra Space Storage Inc. (the “Company”), hereby certify as of the date hereof, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of theSarbanes-Oxley Act of 2002, that the Annual Report of the Company onForm 10-K for the year ended December 31, 2015 (the“Form 10-K”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that information contained in theForm 10-K fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 29, 2016	By:	/s/SPENCERF.KIRK
	Name:	Spencer F. Kirk
	Title:	Chief Executive Officer

I, P. Scott Stubbs, the Chief Financial Officer of the Company, hereby certify as of the date hereof, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of theSarbanes-Oxley Act of 2002, that the Annual Report of the Company onForm 10-K for the year ended December 31, 2015 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that information contained in theForm 10-K fairly presents in all material respects the financial condition and results of operations of the Company.

Date: February 29, 2016	By:	/s/P.SCOTTSTUBBS
	Name:	P. Scott Stubbs
	Title:	Executive Vice President and Chief Financial Officer