A Japanese company is planning to build the world's tallest wooden skyscraper, to mark its 350th anniversary in 2041.

Sumitomo Forestry said 10% of the 70-story 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 wood and steel column, would protect against Tokyo's regular earthquakes, it said.

The projected cost of the building is about 600 bn yen (£4.02 bn; $5.6 bn), about twice the cost of a conventional skyscraper of the same size.

However, Sumitomo says it expects costs to fall before the building's 2041 scheduled completion date due to technological advances.

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