The Council on Tall Buildings and Urban Habitat, one organization that certifies buildings as the "World’s Tallest", recognizes a building only if at least fifty percent of its height is made up of floor plates containing habitable floor area.[1] Structures that do not meet this criterion, such as the CN Tower, are defined as "towers".
There are dozens of radio and television broadcasting towers which measure over 600 metres (about 2,000 ft) in height, and only the tallest are recorded in publicly available information sources.
Source: http://en.wikipedia.org/wiki/List_of_tallest_buildings_and_structures_in_the_world
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