|This article relies on references to primary sources. (April 2010)|
|The Ultima Tower|
|Height||3,218.7 metres (10,560 ft)|
|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. 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.
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. The building is intended to handle problems with overpopulation and to create a "mini-ecosystem" for its inhabitants.
- "The "Ultima" Tower, Two-mile High Sky City". Tsui Design and Research Inc. Retrieved 2010-04-01.
- Blain, Loz (May 4, 2008). "Two-mile high termite nest proposed to counter the population challeng". Gizmag. Retrieved July 17, 2011.