George Grandstaff's three-story frame and weatherboard gristmill was added to a mill complex developed in 1813 by his father. The irregularly shaped building rests on a limestone foundation. Additions made at the turn of the twentieth century include the shed-roofed sections along the sides and a one-story gable-roofed office at the front. At about the same time, the mill was modernized as a roller mill. The mill operated until 1978 when it briefly became a restaurant. In 2000, the Town of Edinburg and the Edinburg Heritage Foundation purchased the mill for use as a visitors' center and museum.