Ultima Tower

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The Ultima Tower
General information
Status Vision
Architectural style Futurism
Height 3,218.7 metres (10,560 ft)
Technical details
Floor count 500
Floor area 1,500,000,000 square feet (140,000,000 m2)
Design and construction
Architect Eugene Tsui Company

The Ultima Tower is a hypothetical supertall skyscraper, designed by American architect Eugene Tsui in 1991. It has been envisioned to be built in San Francisco, California[1] and could potentially accommodate up to 1 million people. With a total height of 3,218.7 metres (10,560 ft), the tower would be 2 miles tall, and comprise 500 stories if built. It is the tallest building / man made structure ever conceived.[2]


The proposed tower would have a diameter at the base of 1,828.8 metres (6,000 ft), and comprise 1,500,000,000 square feet (140,000,000 m2) of interior floor space. Tsui proposed that the tower would be home to 1 million people, and would cost an estimated US$150 billion. The tower would use the atmospheric pressure difference between the bottom and the top of the tower to create electricity throughout the tower.[2] The building is intended to handle problems with overpopulation and to create a "mini-ecosystem" for its inhabitants.[3]


  1. ^ http://listverse.com/2008/09/25/10-fascinating-buildings-never-built/
  2. ^ a b "The "Ultima" Tower, Two-mile High Sky City". Tsui Design and Research Inc. Retrieved 2010-04-01. 
  3. ^ Blain, Loz (May 4, 2008). "Two-mile high termite nest proposed to counter the population challenge". Gizmag. Retrieved July 17, 2011.  External link in |publisher= (help)