Ultima Tower

The Ultima Tower was 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 accommodate up to one million people. With a total height of 3,218 metres (10,558 ft), the tower would be two miles (3.2 km) tall, and comprise 500 stories if built. It is one of the tallest buildings/man-made structures ever conceived but will not be built.[2]

The Ultima tower
Former namesThe two-mile high tower
General information
Architectural styleModern
LocationSan Francisco, California, U.S.
Town or citySan Francisco
Architectural3218 meters
Tip3353 meters
Antenna spire3353 meters
Roof3218 meters
Technical details
Floor count500
Floor area1.5 billion square feet (140,000,000 m2)
Design and construction
ArchitectEugene Tsui Company


  1. ^ Blogball (25 September 2008). "10 Fascinating Buildings Never Built". listverse.com.
  2. ^ "The "Ultima" Tower, Two-mile High Sky City". Tsui Design and Research Inc. Retrieved 2010-04-01.

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