Charles L. McIntosh was an industrialist who bought a controlling interest in J.I. Case Threshing Machine Co. in 1895. He became a director of Milwaukee Harvester Company in 1902 and moved to Milwaukee. There he bought the lot on Prospect Avenue, which was then Milwaukee's "Gold Coast" - where the elites built elaborate homes. He hired Horatio R. Wilson of Chicago to design his mansion. Wilson laid out a 3-story Neoclassical-styled building clad in red brick and trimmed in brownstone, with a monumental portico supported by four Corinthian columns. Wilson added quoins, a loggia wing, and a dentilated copper cornice. Inside is a mahogany staircase with a Tiffany-designed window on the landing, some parquet floors, ten fireplaces, a music room, and a billiard room. The floors were carefully constructed to absorb noise with layers of deafening quilts and two inches of mineral wool. The house was completed in 1904.