Thomas Properties Group, Inc. operates as a full-service real estate company that owns, acquires, develops, and manages office properties and related parking garages, and mixed-use and residential properties in the United States. The company focuses on the acquisition and ownership of properties; property development and redevelopment; and property management activities. It also offers advisory services to institutional investors on property portfolios. As of December 31, 2012, the company owned interests in and managed 17 operating properties with 10.3 million rentable square feet; provided leasing, asset, and/or property management services on behalf of third parties for an additional 5 operating properties with 2.6 million rentable square feet; and had ownership interests in developable land totaling approximately 3.4 million square feet. Its properties are located in Southern California and Sacramento, California; Philadelphia, Pennsylvania; Northern Virginia; and Houston and Austin, Texas. The company was founded in 1996 and is headquartered in Los Angeles, California.