The Kosaka Building, completed in 1985, stands as a notable example of office architecture from the mid-1980s in Tokyo's Nerima ward. Designed by Takeo Kimura and Shuntaro Noda in collaboration with Architectural Environment Planning TAO, this structure reflects the architectural sensibilities of its era. Located in the Toyama Nakachō area, the building demonstrates the designers' approach to functional office space during Japan's bubble economy period. The collaboration between the architects resulted in a distinctive presence within its residential neighborhood, showcasing the design principles and material choices characteristic of late twentieth-century Japanese commercial architecture.