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Extra Space Storage (NYSE: EXR) is a US provider of self-storage units, with 1,483 facilities across 39 states plus Washington, D.C. and Puerto Rico. Headquartered in Cottonwood Heights, Utah, Extra Space Storage is the second largest owner and/or operator of self-storage properties in the United States, as well as the largest self-storage management company.Extra Space Storage has been a publicly traded real estate investment trust (REIT) since 2004, and is traded on the New York Stock Exchange with the ticker symbol EXR. The company was founded in 1977 by Kenneth Woolley, who remains the chairman. Since 2017, Joseph D. Margolis has served as the company's CEO. Extra Space Storage is the successor to Extra Space Development Co., a limited partnership that was founded in 1979, two years after Kenneth Woolley built his first self-storage facility, under the name Secure-It Mini Storage, in Billings, Montana with Bill Nielson of Nielson Enterprises.