In 1991, exactly 30 years ago, River City 21 East Towers was completed as a pioneer in Tokyo waterfront development and the prototype of tower-type high-rise condominiums that prioritize views. Located in Tsukuda 2-chome, Chuo-ku, it boasts an excellent location with easy access from Tsukishima Station as the nearest station, as well as Tokyo Station and Ginza Station, making it an area with a diverse range of residents. In the Edo period, it was also known as Ishikawajima, and within the modern cityscape, you can feel the history of the Showa era in various places, such as Tsukishima's unique food culture and the shopping streets that exude the atmosphere of old Tokyo, creating a unique culture even within Tokyo. This project was planned with the aim of extensively renovating the condominium complex (four buildings), including public open spaces, in order to welcome new residents and to further increase the asset value. [Solution] In solving the client's challenges, we planned the project with a new concept called "1.5 Place," which means creating a 2nd Place function and a 3rd Place time around one's 1st Place, which is one's home. Furthermore, through the implementation and analysis of surveys conducted among residents, we confirmed that there was no discrepancy between the functions and concept design direction of the newly constructed rooms and spaces. In particular, in order to respond to the requests of residents that became clear from the survey analysis, we planned not only to improve the functionality of the entrance, meeting room, and lounge, but also to co-working spaces that anticipate diverse ways of living, working, and gathering, as well as places where communication can be fostered. This created a "highly social and altruistic space" and a "space whose value increases over time," leading to improved resident satisfaction and the realization of new attractions. We also proposed from an SDG perspective, and in addition to solving the problem of sustainable economic and social conditions as discussed in general terms, we understood the place and user perspective of this project, and while taking into account factors that influence the living environment such as tradition, culture, and local conditions, we imbued concept design concept and materials with meaning and realized an approach that is appropriate for this property. In realizing these solutions, our company's various sections worked together as a unified team, reliably utilizing design, layout, research, promotion, and construction capabilities to respond quickly and accurately to the client's requests. <Our Project Members> [Development] Takuya Kitai, Kayu Tatsumi [Sales & Project Promotion] Kayu Tatsumi, Midori Nakayabu [Research & Analysis] Sayuri Murata, Ai Ichikawa [Overall Direction] no.10: Keita Aono [design, layout] no.10: Naoaki Yokoyama, Gen Tomita, Mayu Araki, Asuka Tomioka [Sign & Graphic Direction] no.10: Asuka Tomioka [Product Management] Manabu Fukuda, Takashi Arai [Equipment Design] Takaya Ota [Production, construction & Site Supervision] Takashi Arai, Katsumi Chikada, Kyosuke Sasa