Mid-America Apartment Communities, Inc. is a self-administered and self-managed real estate investment trust (REIT). The Company focuses on acquiring, owning and operating apartment communities in the Sunbelt region of the United States. The Company�s segments include Large market same store communities , Secondary market same store communities and Non same store communities and other . As of December 31, 2012 , the Company owned 100% of 160 properties representing 47,809 apartment units. Four properties include retail components with approximately 108,000 square feet of gross leasable area. As of December 31, 2012 , the Company also had 33.33% ownership interests in Mid-America Multifamily Fund I, LLC, or Fund I, and Mid-America Multifamily Fund II, LLC, or Fund II, which owned two properties containing 626 apartment units and four properties containing 1,156 apartment units, respectively. These apartment communities were located across 13 states.