Sumitomo Forestry said 10% of the 70-storey W350 tower would be steel, combined with about 180,000 cubic metres of indigenous wood.

There will be about 8,000 homes, with trees and foliage on balconies at every level, it said.

A "braced tube structure", diagonal steel vibration-control braces at the centre of a 350m (1,150ft) wood and steel column, would protect against Tokyo's regular earthquakes, it said.

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