U.S. Steel Tower, also known as the Steel Building is the tallest skyscraper in Downtown Pittsburgh, Pennsylvania, and the 35th tallest in the United States. Completed in 1970, the tower has 64 floors to 841 ft and has 2,300,000 square feet of leasable space. Its original name was the U.S. Steel Building for many years before it 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. Although no longer the owner of the building, U.S. Steel is one of the largest tenants, occupying more than a half million square feet of office space. The building is located at 600 Grant Street. On clear days, it is possible to spot the U. S. Steel Tower from as far as 50 miles away, from the top of Chestnut Ridge in the Laurel Highlands southeast of the city.