The Palmer Mansion, constructed 1882–1885 at 1350 N. Lake Shore Drive, was once the largest private residence in Chicago, Illinois, located in the Near North Side neighborhood and facing Lake Michigan. It was designed by architects Henry Ives Cobb and Charles Sumner Frost of the firm Cobb and Frost and built for Bertha and Potter Palmer. Palmer was a prominent Chicago businessman who was responsible for much of the development of State Street. The construction of the Palmer Mansion on Lake Shore Drive established the "Gold Coast" neighborhood, still one of the most affluent neighborhoods in the city.