Pittsburgh, the second-largest city in the U.S. state of Pennsylvania, is home to 135 completed high-rises, 29 of which stand at least tall. The tallest building in Pittsburgh is the 64-story U.S. Steel Tower, which rises and was completed in 1970. It also stands as the fourth-tallest building in Pennsylvania and the 43rd-tallest building in the United States. The second-tallest skyscraper in the city is BNY Mellon Center, which rises .