SALT LAKE CITY, UT (REIT Media) Dec 20, 2007 - Extra Space Storage Inc. (the "Company") (NYSE:EXR) announced today it will be added after the close of trading Monday, December 31, 2007, to the S&P SmallCap 600 Index under the GICS (Global Industry Classification Standard) specialized REITs sub-industry index.

According to Standard & Poor's, the S&P SmallCap 600 Index covers about 3% of the U.S. equities market. It is intended to be an efficient portfolio of companies that meet specific inclusion criteria to ensure that they are both investment-worthy and financially viable.

"We are glad to be included in this highly regarded and long-followed index," said Kenneth M. Woolley, Chairman and CEO of Extra Space Storage. "Our addition to this index represents further acknowledgment of our achievements as a leader in our industry."

About Extra Space Storage Inc.

Extra Space Storage Inc., headquartered in Salt Lake City, Utah, is a fully integrated, self-administered and self-managed real estate investment trust that operates 644 self-storage properties in 33 states and Washington, D.C. The Company's properties comprise approximately 444,000 units and 47 million square feet rented by approximately 330,000 individual tenants. The Company is the second largest operator of self storage in the United States.

     For Information:
     James Overturf
     Extra Space Storage Inc.
     (801) 365-4501
      
     Mark Collinson
     CCG Investor Relations
     (310) 477-9800
      
     Extra Space Storage Inc.
      
     PHONE (801) 562-5556
     FAX (801) 562-5579
     2795 East Cottonwood Parkway, Suite 400
     Salt Lake City, Utah 84121
     http://www.extraspace.com