Takenaka Corporation
The proposal consisted of a building tall and wide at the base, with a total floor area of . The design, proposed in 1989 by the Takenaka Corporation, would have housed between 35,000 and 36,000 full-time residents as well as 100,000 workers. It comprised 14 concave dish-shaped "Space Plateaus" stacked one upon the other. The interior of the plateaus would have contained greenspace, and the edges of the building would have contained apartments. The building would have also housed offices, commercial facilities, schools, theatres, and other modern amenities.