Chusanren Building completed in 1963 was designed by Junzo Sakakura, of which design feature is floating volume covered with green tiles and warped eaves. It has experienced its renovation many times, and interestingly the owner itself has decided each renovation policy, without asking Sakakura. I summarized how it has been renovated and evolved, through architectural drawings, repair records, interviews, and confirmation of the current conditions. Consequently, it became clear that the parts of the building related to its design feature are mostly maintained, and only the other parts are functionally updated for its purpose from time to time.
