The work entitled “Symbiont: Proposal for the coexistence of a new generation of seniors” concerns the reuse of a former hospital on the seafront of Thessaloniki that has been abandoned for over ten years. The aim of the design is to understand the needs and practical problems faced by elderly people. Through their own wishes, a building is designed that includes, among others, uses such as housing, a café, engaging in manual activities and social interaction of people of different ages. It is also made open to the public, providing basic medical services and a physiotherapy and recovery area. The residents and users of the building have the opportunity to choose the amount of time they will spend in it while it serves the daily needs of individuals of younger age, providing freshly cooked food by its users or its staff. The idea for its design was to create a multi-space where parallel activities can take place and it will be open to both the elderly and the younger ones with the main operating principle of caring for and empowering local communities. This way, older people will remain active and will be offered a more dignified living while being motivated to participate in peer groups and meet new people by doing activities that interest them.