High Quality Content by WIKIPEDIA articles! The Xujiahui Tower is a supertall skyscraper that is proposed for construction in Shanghai, China. It was designed by the Atlanta based firm John Portman & Associates, Inc. If built, it would be the second tallest building in Shanghai, after the Shanghai World Financial Center. It would have 92 floors and stand at 460 meters, or 1,509 ft. A skyscraper is a tall, continuously habitable building. There is no official definition or height above which a building may clearly be classified as a skyscraper. Most cities define the term empirically; even a building of 80 meters (262 feet) may be considered a skyscraper if it protrudes above its built environment and changes the overall skyline.

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