The Hammack Building is located on property once owned by John Chrisman, who helped survey the town of Gatesville in 1854. The building was constructed by W. W. Hammack (1860-1913) in the late 1800s. Over the years, the Hammack family leased the structure, which has housed the Gatesville National Bank, a saloon, a drugstore, and other commercial establishments. The Italianate style building features elaborate brickwork.