This is a house and an atelier of architect Yoshiharu Tsukamoto. In his building called “House and atelier Bow-Wow”, Agaho Lever Handle 148 is used.
Lever Handle 148 is awarded iF product design award gold in 2008.
However, what WEST is particular about is not only the design of lever handle, but also the usability. Three holes made to be arrached to a key holder. Each hole has a different gravity point so it is easier to find the right key if you use different hole when attach the key holder.
More information on Agaho Lever Handle 148 and other items can be found at: http://www.west-inx.com/product/