This paper reports about a reinforced concrete apartment buiding in Komagome, Tokyo (1938). The apartment house was planned for foreigners from Europe & North America, and the Japanese client. Therefore the planning and style of windows were different from ordinary Japanese apartment buildings in those days. Kotaro Ebata was the architect, who had worked at the office of Kazue Yakushiji. Yakushiji is a famous Architect in Japan in those days. And he may have been a friend of the client since they were sutudents.