About 1801 California Street
1801 California Street, also known as Qwest Tower, is a skyscraper in Denver, Colorado. The building was completed in 1983, and rises 52 floors and 709 feet (216 m) in height. The building stands as the second-tallest building in Denver and Colorado, and as the 111th-tallest building in the United States. 1801 California Street was previously occupied by offices for US West, but now serves as the world headquarters of Qwest Communications. Upon its completion in 1983, the building stood as the tallest building in the city. However, it held it's distinction for less than a year, being surpassed by Republic Plaza in 1984. The building has a brown concrete façade, and has a stepped design featuring four setbacks. It is an example of late-modernist high-rise architecture. The shape of the building resembles two interlocked octagonal sections, which separate near the building's roof. The roof houses an antenna mast; with this structure included, the building reaches to a total height of 738 feet (225 m), surpassing the 717-foot (219 m) roof of Republic Plaza. Therefore, when measuring by pinnacle height, 1801 California Street remains the tallest building in Denver.