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The Council on Tall Buildings and Urban Habitat certifies Taipei 101 as the world's tallest building, based on the building having been topped out on 1 July 2003, even though the building was not completed until 31 December 2004.

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Council on Tall Buildings and Urban Habitat
International body
The Council on Tall Buildings and Urban Habitat (CTBUH) is an international body in the field of tall buildings, including skyscrapers, and sustainable urban design. A non-profit organization based at the Monroe Building in Chicago, Illinois, United States, the CTBUH announces…Source: Wikipedia (CC BY-SA)
Taipei 101
Skyscraper in Taiwan
The Taipei 101, formerly known as the Taipei World Financial Center, is a 508 m, 101-story skyscraper in Taipei, Taiwan. It is owned by Taipei Financial Center Corporation. It was officially classified as the world's tallest building from its opening on 31 December 2004, until…Source: Wikipedia (CC BY-SA)
March 29
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