X-Seed 4000


The X-Seed 4000 is the tallest building ever fully envisioned, meaning that the designs for construction have been completed. Developed by architect Peter Neville, its proposed 4-km height, 6-km wide sea-base, and 800-floor capacity could accommodate 500,000 to 1,000,000 inhabitants. Requiring over 3,000,000 tons of reinforced steel, the construction was estimated to cost US$300–900 billion, in 2006 dollars. It was designed for Tokyo by the Taisei Corporation in 1995 as a futuristic environment combining ultra-modern living and interaction with nature.

Unlike conventional skyscrapers, the X-Seed 4000 would be required to actively protect its occupants from considerable air pressure gradations and weather fluctuations along its massive elevation. Also, the proposed area is situated on the Pacific Ring of Fire, which is the most active volcano range in the world so the structure would be subject to tsunamis and earthquakes. The X-Seed 4000 ‘is never meant to be built,’ says Georges Binder, managing director of Buildings & Data, a firm which compiles data banks on buildings worldwide. ‘The purpose of the plan was to earn some recognition for the firm, and it worked.’


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