Sky City : Tokyo

With a height of 1,000 meters and a total floor area of 800 hectares, SKY CITY 1000 is a superhigh-rise city comprising 14 concave dish-shaped, aerial bases called, "Space Plateaus" stacked one upon the other. Residences, offices, commercial facilities, schools, theaters and so forth are organically located in these spaces. 35,000 people will reside here, and 100,000 people will work here.
Discovery channel interactive report