The “polykatoikia” is still the predominant model of urban habitation, with the ground floor level, however, being degenerated and retreating gradually. The reasons for abandonment may differ, among them the crisis, the weakening of the small and medium-sized commerce and / or the degraded urban environment of the region. Their abandonment leads to a gradual deterioration of the urban environment and is repellent in terms of use of public space environments.

However, the ground floor, as the edge of the building that meets the street, is what comes in direct visual contact with the city users. The human scale in the city has more direct contact,and understanding, of the ground floor of the building than its other parts. This is the point where interacts the indoor with the outdoor. It is the place where easier activities from inside the building can be “moved out” and vice versa. When this spot is active automatically the sidewalk and the road become brighter, its contact in and out enhances the pedestrian movement and the street level acquires a more welcoming character.

Through this diploma thesis, it is attempted to create a program that plans and organizes the temporary activation of the inactive ground floor spaces for shared use of both the tenants of apartment buildings and the residents of the neighborhood. Focusing on strengthening the feeling of the common space in a building or in the neighborhood, besides the design solution, it is also proposed a way of organizing and managing the sites by the users themselves. The functions and uses that they receive are derived from users' needs, desires and initiatives, so the design solution focuses on their “variability” and “transformability” without proposing a stable internal configuration and programmatic action.