The project focus on the theme of the perimeter. Starting from the Milanese “casa a ringhiera”, the aim was to combine this typology with a tower building, activating the perimeter. On the internal side, facing the courtyard, the are the distributional galleries. The facades facing the street, are instead hosting private balconies. The structure of the building is in the external perimeter of the balconies, in this way the second layer, which divides the interiors from the balconies, can have extreme openings freedom and adaptability, without the restriction of the structural grid. The first layer of the facade is made by the grey structural grid, in contrast with the lightness of the white, semi-transparent curtains. The columns are gravel concrete and the bidirectional slabs are polished concrete. The textile curtains can protect the balconies from the sun and the street loudness, as well as give privacy or sharing. The second layer of the facade, by contrast, is a celebration of black, in particular, the glazed clay tiles give a glossy atmosphere at the inside of the balcony, that is treated as a proper outdoor living space. The step-volumes of the facade are given by the relations with the context hights. As well as the base plan is the result of the deep study of the preexistent block and plot. The goal is an Open Building that could have a long lifespan, thanks to is flexibility and possibility of different uses.