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When speaking of the tallest buildings in the world, it is important to specify exactly what is being measured. Listers must decide if the building is to be measured from sidewalk level or below, whether or not TV towers or masts are included, and whether an antenna, flagpole, or spire should count. A building is considered to differ from a tower in its primary use, being designed for residential, business, manufacturing, or mixed use, whereas a tower is not.