The U.S. Steel Tower is a 64-story skyscraper at 600 Grant Street in downtown Pittsburgh, Pennsylvania. Standing at 842 feet, it is the tallest building in Pittsburgh and it is the tallest building in the world with a completely flat roof. The roof itself, at approximately one acre in size, is the largest roof in the world at its height or above. |
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| U.S. STEEL TOWER PITTSURGH, PENNSYLVANIA |
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