Potter Palmer's colossal mansion has been long erased from Chicago's streetscape, but Palmer's influence on Chicago real estate development can still be felt throughout the downtown area. Palmer built one of the country's finest hotels and a few mansions in the Gold Coast neighborhood. This mansion on Astor Street dates back to 1898 and sports a tall, limestone-clad facade. The five-level mansion features 8,000-square-feet of space, with four bedrooms and seven and a half bathrooms. According to the listing agent, the home's interior has been remodeled by Michael Graham of Liederbach & Graham Architects. Filled with ornate millwork, marble and fancy wallpaper, this home is a mansion's mansion and its $7.2 million asking price certainly reflects this.