Gulf States-United Telephone Company constructed this ell-shaped telephone exchange building between 1949 and  1966, replacing an earlier telephone exchange building on this block. According to the Erath County Appraisal District,  this three-story brick building was constructed in 1952. The south elevation, along W. Mason St., has five upper  window openings enclosed with brick. Along the sidewalk, there are two doors. The east elevation, along N. Columbia  Ave., features an enclosed large bay and one enclosed upper window, both filled with brick. The building has a flat  roof. In 1966, Gulf States-United Telephone Company invested $375,000 to construct a second telephone exchange  facility in Stephenville because of the community’s growth. They constructed the new facility in the northwestern area  of the city.