The project involves the renovation of a two-story house in Volos, built with the Paraskevopoulos system, with the aim of creating four autonomous apartments, oriented towards long-term leasing. The design is based on preserving the architectural heritage of the building, highlighting characteristic elements such as the pre-existing arch. This arch is used as a central element that defines the functional transition of the spaces in each apartment, creating a harmonious link between tradition and modern aesthetics. Each apartment will include an open-plan living room and kitchen area, a bedroom, bathroom, as well as storage spaces to meet daily needs. At the same time, functional and energy autonomy is ensured for each apartment. This design allows for the complete independence of the tenants, while enhancing the functionality of the spaces. In the design of the interior spaces, materials play a decisive role in the aesthetics and functionality of the apartments. Mosaic tiles, inspired by the era of the building’s construction, will be used to maintain the traditional character, while wood will be incorporated to give a sense of warmth and intimacy to the spaces. The dominant shades are light, aiming to create bright and pleasant spaces, while the lighting is precisely designed to ensure sufficient brightness in each apartment, highlighting the architectural features and enhancing the comfort of the residents. The intervention in the building is carried out with respect for the static elements of the building and its architectural character, avoiding radical interventions that could alter its identity. On the contrary, the approach emphasizes the preservation of traditional elements, such as openings, creatively integrating them into a modern design that will combine ergonomics with aesthetics. In this way, the building will be transformed into a modern, functional and attractive residential complex, ideal for long-term rental, while offering a harmonious combination of historical identity and modern life.