CASACO is a contemporary residential and commercial facility completed in 2016, designed by TOMITO ARCHITECTURE and located in Yokohama's Nishi Ward. This innovative structure thoughtfully integrates living spaces with retail functions, representing modern Japanese architectural practice. The building's design responds to its hillside location in the Higashigaoka neighborhood, creating a harmonious relationship between the built environment and its topographic context. Through its careful spatial planning and mixed-use approach, CASACO exemplifies how contemporary architecture can revitalize local communities while maintaining sensitivity to urban character. The project demonstrates the architect's commitment to creating versatile spaces that serve both residential and commercial purposes within Japan's evolving urban landscape.