Exhibit 99.1 Extra Space Storage Inc. PHONE (801) 365-4600 2795 East Cottonwood Parkway, Suite 300 Salt Lake City, Utah 84121 www.extraspace.com FOR IMMEDIATE RELEASE Extra Space Storage Inc. Reports 2023 Fourth Quarter and Year-End Results SALT LAKE CITY, February 27, 2024 — Extra Space Storage Inc. (NYSE: EXR) (the “Company”), a leading owner and operator of self-storage facilities in the United States and a constituent of the S&P 500, announced operating results for the three months and year ended Decemb ...