The Yonezawa Koki Headquarters Building, completed in 1992, stands as a notable example of early 1990s Japanese commercial architecture. Located in the Todoroki district of Setagaya Ward, Tokyo, this office building was designed by Ishibashi Tokugawa Architectural Design Office. The structure reflects the design sensibilities of its era, representing the practical approach to corporate workspace design that characterized Japan's bubble economy period. With its functional aesthetic and efficient layout, the building serves as an interesting case study in late twentieth-century Japanese office architecture and urban development within Tokyo's residential neighborhoods.