U.S. Steel Tower, also known as the Steel Building (formerly USX Tower) is a 64-story, 256.34 m (841.0 ft) skyscraper with 2,300,000 sq ft (210,000 m2) of leasable space at 600 Grant Street in downtown Pittsburgh, Pennsylvania. It is the tallest skyscraper in Pittsburgh, the fourth tallest building in Pennsylvania, the 41st tallest in the United States, and the two hundred and twentieth tallest building in the world. It held its opening dedication on September 30, 1971.
The tower's original name when completed was the U.S. Steel Building and was changed to USX Tower in 1988. The name was finally changed back to the U.S. Steel Tower in January 2002 to reflect U.S. Steel's new corporate identity (USX was the 1990s combined oil/energy/steel conglomerate). Although no longer the owner of the building, U.S. Steel is one of the largest tenants. The building is located at 600 Grant Street, ZIP code 15219.(Wikipedia)
"U.S. Steel Tower"