X-Seed 4000










X-Seed 4000 - the highest building ever conceived.

Its height should be 4 000 meters above sea level. Thanks to 600 - meter foundation construction can be placed directly over the sea. X-Seed of 4000 should include 700 000 to 1 000 000 residents.

The project is developed for the capital of Japan construction company "Tasai Corporation" as the building of the future, will be combined with ultra-modern life and interaction with nature. Unlike conventional skyscrapers, X-Seed 4000 will protect its inhabitants from the pressure and the change of weather conditions throughout the height of the building. Its design makes use of solar energy system-wide maintenance of the microclimate in the building.

Elevators are designed for 200 passengers and deliver to the upper floor for 30 minutes. In addition to thousands of apartments and offices in the X-Seed 4000 and will be entertainment centers and parks, and forests.

It is anticipated that the price of construction X-Seed 4000 would be 300-900 billion dollars.

Plan H-Seed 4000 is calculated at 8 years of construction.

Project X-Seed 4000 falls within the definition arkology.


Location Tokyo, Japan
Status Vision
Roof 13,123 ft (4000 m)
Technical details
Floor count 800
Architect Taisei Corporation