The X-Seed 4000 was a concept skyscraper.[1] The idea was initially created and developed by Martin Pascoe. Its proposed 4-kilometre (2.5 mi) height, 6-kilometre-wide (3.7 mi) 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 steel.
I think you’d love the X-Seed 4000 then: https://en.wikipedia.org/wiki/X-Seed_4000