|Extra Space Storage Inc. is a self-administered and self-managed real estate investment trust (REIT). The Company owns, operates, manages, acquires, develops and redevelops professionally managed self-storage facilities. As of December 31, 2011, Extra Space Storage Inc. held ownership interests in 697 operating properties. Of these operating properties, 356 are wholly owned, and 341 are owned in joint venture partnerships. An additional 185 operating properties that are owned by franchisees or third-parties in exchange for a management fee, bringing the total number of operating properties, which it owns and/or manages to 882. The Company operates in three segments: property management, acquisition and development; rental operations, and tenant reinsurance.