Sumitomo Forestry Co. Ltd. has announced that it plans to build a 70-story 350-meter mixed-use skyscraper in Marunouchi, a central Tokyo business district, by the year 2041. [...]
The project [...] is estimated to cost 600 billion JPY (5.5 billion USD). This is almost twice that of conventional high-rise buildings using current technology, but the company hopes to reduce costs by making technological advances in wood-based construction.
— Real Estate Japan
Wooden skyscrapers have been seeing an unprecedented boom phase in recent years, but even the more ambitious projects don't even come close to what Japanese company Sumitomo Forestry, in collaboration with Nikken Sekkei, is proposing to build in Tokyo by the year 2041.
To pull off the massive structure required for a 350-meter, 70-story wooden tower, as the concept W350 plan outlines, 185,000 cubic meters of timber are needed — the equivalent of 8,000 single-family homes.
"The planned structure is a hybrid wood and steel structure made from 90% wooden materials," the company explains. "It will use a braced tube structure in which steel frame vibration control braces (diagonal braces) are positioned inside a column and beam structure, made from a combination of wood and steel."
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