The X-Seed 4000 is the tallest building designed ever in the human race. The designs of the construction have been completed by Taisei Corporation. Which was designed for Tokyo, Japan.
This X-Seed 4000 "was never meant to be built" says Georges Binder, managing director of Buildings & Data. The purpose of the plan was to know the skill ability of the company and contractors, which I think.
Technical Facts:-
- Height: 4,000 meters (13,123 ft)
- 6 km (3.7 mi) wide sea-base
- 800 floors
- cost to construct the X-Seed 4000 around (US$300-900 billion dollars)
- Will have Solar Power to maintain the internal environment conditions.
For more Information about X-Seed 4000 check the following Sites:
- http://en.wikipedia.org/wiki/X-Seed_4000
- X-Seed 4000 the tallest building planned on Planet Earth
- X-seed 4000
Looks soon will be living in Star wars age. 
http://sc1.sclive.net/13.0.1376.0207/Web/Parts/PhotoAlbum/script/slideshow.swf
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Mundhir