Quality Hill (The John Thomson Mason House) is a well-proportioned, late 18th century house which faces south on the northeast corner of 35th Street and Prospect Street (Georgetown). The free-standing house is constructed of Flemish bond brick painted light grey with a molded stone water table at the first floor line. Quality Hill is one of the finest of the few surviving large, free-standing late Georgian town houses of Georgetown. It was built around 1797-98 and first occupied by John Thomson Mason. From its first to its present owner, Quality Hill has been occupied by individuals prominent in local and national affairs.
DC Inventory: November 8, 1964
National Register: March 16, 1972