Sumitomo Forestry have scheduled the building to be completed by 2041 with the expectation that advances in construction techniques will have allowed the cost of wooden skyscrapers to drop considerably.
Sumitomo Forestry (smfrf), the Japanese wood products company, is planning to build the skyscraper to commemorate its 350th anniversary in 2041.
Designed by Sumitomo Forestry and the architecture firm Nikken Sekkei, the W350 tower will be a flagship of sustainability thanks to its unique construction that use some 185,000 square meters of wood.
In 2010, the Japanese government enacted the Act for Promotion of Use of Wood in Public Buildings, promoting a shift to wooden structures for public buildings. 90% of the structure would be made up from wooden materials and a "braced tube structure" would be fitted at the centre of a 350m wood and steel column to protect from earthquakes and wind.
Named W350, the ambitious tower would be nearly four times higher than the world's current tallest timber building - the 18-storey Brock Commons Student Residence in Vancouver, Canada. The institute is expanding possibilities for wooden buildings as a roadmap for future technology such as the development of building methods, environmentally-friendly technologies, and trees that become resources and building materials.
"The interior structure is made of a pure wood, producing a calm space that exudes the warmth and gentleness of wood", said Sumitomo.
There will be trees and foliage on balconies at every level.
Construction of the W350 is expected to cost 600 billion yen (S$7.4 billion) - nearly double that of a conventional high-rise building. Going forward, the economic feasibility of the project will be enhanced by reducing costs through technological development.
"We will strive to create environmentally-friendly and timber utilizing cities to Change Cities into Forests".