Opened in 1990 near Monument Circle in Indianapolis, the Chase Tower (formerly known as the Bank One Tower and originally conceived as American Fletcher Tower) is the tallest building in the U.S. state of Indiana. It surpassed the AUL Tower (now OneAmerica Tower) in Indianapolis for the distinction. The building's twin spires pierce 830 feet (250 m) into the Indianapolis skyline, while the 48 floors of office and retail space below peak at the 700 feet (214 m) roof. It is the headquarters for Chase's (formerly Bank One's) Indiana operations. While the building has two spires of equal height, only one of them is actually functional as a transmission antenna. The other mast is merely an architectural decoration.