The South Building's tower was designed by the architectural firm of Napoleon LeBrun & Sons and erected between 1905 and 1909. Inspired by St Mark's Campanile, the tower features four clock faces, four bells, and lighted beacons at its top, and was the tallest building in the world until 1913. The tower originally included Metropolitan Life's offices, and since 2015, it has contained a 273-room luxury hotel known as the New York Edition Hotel. The tower was designated as a city landmark by the New York City Landmarks Preservation Commission in 1989, and was listed on the National Register of Historic Places in 1972. It was also made a National Historic Landmark in 1978.