The project is an attempt to approach the par excellence public space of the block, the open air space. It is based on the theoretical research that came before and had the intension to investigate the comprehension, behavior and activity of the users in the open space, in an existing block. Despite the fact that the open space could be livable and exploited as a common action space, due to its scale and the good climatologic conditions that prevail in Greece, it is a hardly used and mistaken space.
   The above conclusion led to the creation of a legalism, instead of the article 13 of the General Building Law of Greece of the year 2000, about the “active” block, the application of which is proposed on an existing block.
   The project aims at the jumping over the malign consequences that create the separated study of each building site, at the exploitation of the open space of the block, and the service of the social needs of the habitants of the block, at the rehabilitation of the block, especially by the unification of the open spaces of its building sites, the opening up, at the ground floor of the buildings, of accesses from the common use space to the united open air space of the block, the creation of spaces and installations of common use in order to serve its habitants, at the rehabilitation of the rooftop and the facet of the buildings of the block, and in general at interventions that promote the amelioration of the living conditions of the habitants.
   The article that is proposed defines three degrees of intervention, each one of which is the evolution of the previous, allowing the choice of the appropriate intervention. In addition, the benefit of financial motivations is proposed in order to implement the law.
   As an example for the enforcement of the proposed law, is chosen the open space that is located in the interior of a rectangular block at Bolos, in a short distance from downtown and is the result of seven open spaces of different apartment buildings, as it is a typical case of such a form of space in a block of the Greek city.