One Roof Apartment is a residential complex completed in 2010, located in Tsutsui, Joetsu City, Niigata Prefecture. Designed by the architectural firm of Yoshihara Mihiko and Akira Hirata, this multi-unit housing project showcases contemporary residential design principles. The building demonstrates thoughtful consideration of communal living spaces while maintaining individual unit privacy. Its construction reflects modern approaches to sustainable urban housing, making it an exemplary work of early 2010s Japanese residential architecture that merits study by architecture professionals interested in the evolution of apartment complex design.