Established by Congress in 1970, Freddie Mac is a stockholder-owned corporation that offers a range of mortgage services to homebuyers throughout the United States. It specializes in mortgage purchase, credit guarantee and portfolio investment activities. The company provides loans for a variety of properties, including single-family apartments, multifamily residences, townhomes, duplexes and apartments. Freddie Mac manages a staff of market data coordinators, finance analysts, project managers and support personnel. It also offers tips on home buying. The company additionally provides an online mortgage and closing cost calculator to assist in estimating closing costs and monthly mortgage payments. Freddie Mac maintains a location in Carrollton, Texas.