The X-Seed 4000 is a building project developed by Taisei Corporation, when constructed it will become the tallest building on Earth, eight times larger than the current tallest building, Burj Dubai.
The X-Seed 4000 is planned to be built in the near future, and when constructed fully will span 4 kilometers in height (13,123 foot), 6 kilometer wide sea-base and will have 800 floors with a capacity that could accommodate 500,000 to 1,000,000 inhabitants.

It is being designed by Taisei Corporation and will be built on Tokyo, Japan with their main theme for the building is to offer a futuristic environment combining ultra-modern living and interaction with nature.

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