Now home to the Giles County Historical Museum, the building is thought to be the oldest surviving brick house in the county. The house was built for brothers Andrew and David Johnston and occupied by Andrew Johnston and his descendants for nearly a century. The modest Federal two-story, center-passage house is highlighted by a Greek Revival one-story portico with paired square and round Ionic columns and a regionally popular molded brick cornice. Also on the grounds is Dr. Harvey G. Johnston's office/clinic (1857–1859), a small weatherboarded frame building. In May 1862 the office served as the temporary headquarters of Federal troops of the Twenty-Third Ohio Regiment under the command of Colonel Rutherford B. Hayes and Major William McKinley (the nineteenth and twenty-fifth presidents of the United States).