Architecture, Building and Structure Design Sakai5 Private house by Shunichiro Ninomiya It is a small house built on diamond-shaped irregular land. The site is located in Sakai city, Osaka Prefecture. It is a location that is chaotic and not good, mixed with the surrounding environment. It is a typical urban type housing with many constraints of three floors of a narrow area. Just to live easily, I wanted the cityscape to be attractive with unique design that made use of the features of the site with the power of design.