Healthcare Trust of America, Inc. (HTA) operates as a real estate investment trust (REIT). HTA does not conduct business itself, other than acting as the sole general partner of Healthcare Trust of America Holdings, LP (HTALP). As of December 31, 2014, HTA owned a 98.5% partnership interest in HTALP. HTA owns and operates medical office buildings (MOBs) in the United States and is focused on building and maintaining a portfolio comprised of MOBs that offer healthcare services. As of December 31, 2014, HTALP's portfolio consisted of approximately 14.8 million square feet of gross leasable area (GLA), with a leased rate of 92.0%. As of December 31, 2014, 96% of HTALP's portfolio based on GLA, are primarily located on the campuses of, or aligned with, nationally and regionally recognized healthcare systems in the United States. These include health systems, such as Hospital Corporation of America, Highmark, Greenville Hospital System, and Indiana University Health, among others.