This project involved the renovation of "River City 21 Shinkawa," a tower residence with 505 units completed in 1995. Located on the Sumida River, facing the Chuo Ohashi Bridge, this property boasts a riverside location with abundant nature and expansive views. The Chuo Ohashi Bridge, which spans the foot of the condominium, is illuminated at night and is known as a landmark in the Tsukuda area. A promenade has been built along the Sumida River, making it a place of relaxation for local residents who enjoy walking and jogging. The residential units offer a wide range of options, from 1R and 1K single-person plans to 2LDK, with a variety of unique layouts, including Japanese-style rooms with Ryukyu tatami mats and plans with spacious storage rooms. Following a change of ownership, our mission was to add value to this pioneering waterfront tower condominium, a property with high potential where nature and the city coexist, to suit the modern era, and we undertook the design and construction.