The U.S. Steel Tower, also known as the Steel Building or USX Tower (1988–2001), is a 64-story skyscraper at 600 Grant Street in downtown Pittsburgh, Pennsylvania. The interior has 2,300,000 sq ft (210,000 m2) of leasable space. Standing 841 ft (256 m) tall, it is the tallest building in Pittsburgh, the fifth-tallest in Pennsylvania, the 69th-tallest in the United States, and the 200th-tallest in the world. It held its opening dedication on September 30, 1971.