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The Gulf Building is a 582ft (177m) tall skyscraper in Pittsburgh, Pennsylvania. It was desined by Trowbridge & Livingston for the Gulf Oil Corporation. Completed in 1932, the art deco building was the tallest building in Pennsylvania for almost 40 years. The top of the building is colorfully lit up at night, with different colors and patterns symbolizing different weather forecasts. This soaring building was constructed on the site of the United States's first oil refinery.