Thr structure was an early auto repair and garage, servicing Hillsboro and those traveling the Central Highway/State Highway 10. It was likely built circa 1915 (i.e. sometime between 1913 and 1924).
1924 Sanborn map excerpt
The 1943 Sanborn map shows it still in use for automotive storage and/or repair. It burned sometime in the 1950s.
1943 Sanborn map excerpt
On fire, circa 1950s (photo courtesy of the Alliance for Historic Hillsborough)