Although an official definition does not exist, a supertall is generally a completed structure that is at least 300 meters or 1000 feet tall. If a building is being proposed, it must be at least 1 kilometer tall to be classified as a supertall.
The term supertall may be applied to any structure, including buildings, free standing towers, guyed masts, and bridge pillars.
There are about 1,150 supertalls worldwide, most of which are guyed masts in the United States.
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