The X-Seed 4000 is the tallest building ever fully envisioned, meaning that the designs for construction have been completed. The idea was initially created and developed by Peter Neville. Its proposed 4-kilometre (2.5 mi) height, 6-kilometre (3.7 mi) wide sea-base, and 800-floor capacity could accommodate 500,000 to 1,000,000 inhabitants. This structure would be composed of over 3,000,000 tons of reinforced steel.
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