The Algonquin Casino is a concrete building in the high-end Prairie style. The Prairie style, popularized by Frank Lloyd Wright (1867-1959), is an evolution of the Craftsman style. Compared to regular Craftsman-style buildings, this structure features a lower hipped roof with very wide overhanging eaves. Cylindrical pillars supporting these eaves form an open veranda along the front façade. There is also a glassed-in veranda on the building's side and a southern wing.

Over the years, the casino hosted a number of activities. The basement featured a billiard room and a bowling alley; meanwhile, at different times the open upstairs room served as a dance floor, a dining hall, a conference room, and a theatre. Throughout WWII, the casino also hosted several charitable events supporting the war relief effort, which were held by organizations such as the Red Cross. Currently, the building is still operating and is now called 'the Van Horne Ballroom'.