Tatsumi Apartment House is a contemporary mixed-use residential and commercial building located in Koto Ward, Tokyo. Completed in 2016, this project was designed by Itoh Hiroyuki Architects. The structure exemplifies modern urban design principles, seamlessly integrating residential apartments with retail and commercial spaces. Its thoughtful architectural approach responds to the dynamic character of Tokyo's waterfront district. The building demonstrates sophisticated planning that balances residential privacy with vibrant street-level commercial activity, making it an important case study in contemporary Japanese urban architecture and sustainable mixed-use development.