X-Seed 4000

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A picture of what the X-Seed 4000 would look like.

The X-Seed 4000 is the tallest building ever fully envisioned, meaning that the designs for construction have been completed.

The X-Seed 4000 "was 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."^[1]

Its proposed 4000m height, 6 km wide sea-base, and 800 floor capacity could accommodate five hundred thousand to one million inhabitants.

It was designed for Tokyo, Japan by the Taisei Corporation in 1995^[2] as a futuristic environment combining ultra-modern living and interaction with nature.^[3]

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. Its design calls for the use of solar power to maintain internal environmental conditions.

A sea-based location and a Mount Fuji shape are some of this building's other major design features — the real Mount Fuji is land-based and is 3776 m in height, nearly 224 m shorter than X-Seed 4000.

Some estimate that the cost to construct the X-Seed 4000 structure may be somewhere between US$300-900 billion, in 2006 dollars.^[4]

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v • d • e Proposed supertall skyscrapers

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Cancelled	1 New York Place • 7 South Dearborn • 80 South Street • Ameritrust Tower • Bank of the Southwest Tower • Center City Tower • City Tech Tower • Chicago World Trade Center • Crown Las Vegas • Eaton's / John Maryon Tower • Grollo Tower • Hotel Attraction • Ice Tower • Larkin Building • London Millennium Tower • Marina Gardens • Miglin-Beitler Skyneedle • Najd Tower • Palace of Soviets • Palacio de la Bahia • Park Square Tower • Project 2000 • Sapphire Tower • South Ferry Plaza • Torre Generali • Torre Bicentenario • Torre Bicentenario II • Tour Sans Fins

Visions	Citygate Ecotower • DIB-200 • Houston Tower • Kostabi World Trade Center • Millennium Tower, Tokyo • Shimizu Mega-City Pyramid • Sky City 1000 • Tatlin's Tower • The Illinois • Vortex Tower • X-Seed 4000

See also	Supertall skyscrapers • List of tallest buildings in the world