Kougon-yu is a contemporary commercial facility located in Sumida Ward, Tokyo, completed in 2020. Designed by Jō Nagasaka of Schema Architects and Riko Takahashi, this innovative project transforms a residential building into a dynamic mixed-use space. The architects skillfully integrated the facility across the first and second floors of the Kanazawa Mansion, creating a sophisticated environment that balances modern design principles with practical commercial functionality. The project exemplifies contemporary Japanese architectural practice, demonstrating thoughtful spatial planning and adaptive reuse strategies that revitalize urban commercial spaces while respecting the existing urban fabric.