The Richard J. Daley Center is the premier civic center of the City of Chicago in Illinois. The main building was designed in the International Style by Jacques Brownson of the firm C. F. Murphy Associates and completed in 1965. Originally known as the Chicago Civic Center, the building was renamed for Mayor Daley on December 27, 1976. The 648-foot (198 m), thirty-one story building features Cor-Ten, a self-weathering steel. The Daley Center has 30 floors, and is the tallest flat-roofed building in the world with fewer than 40 stories (a typical 648-foot (198 m) building would have 50-60 stories). (wikipedia.org)