Ginza Small Tower: A Commercial Building on A Site as Thin as An Alley with Concrete Structure
Made of steel and glass, the staircase acts as an expansion joint between the two concrete volumes. The front volume of the building is counterweighed by a matt slab of 1.2 meters due to the seismic risk in Japan and its tall-thin proportion. The architect adds a roof terrace enclosed by a perimeter wall of 2.4m to increase the slenderness. This addition can result in a very unusual proportion of 1:7.7.