M 51 is a residential project, obtained by recovering and expanding the attic level of an elegant 1930s mansion, located in the Porta Susa area, and transforming it into a ' cozy home for a family. The turret, which houses the master area of this fine residence, is an exclamation point on the horizon: it is a volumetric addition, also clad in the same burnished metal roofing, that stands out from the top of the building and is generated by the extrusion of the stairwell. The turret functions as a bedroom but also as a privileged vantage point over the Turinese hill and the city. An elegant contemporary architecture that blends seamlessly into the elevations but stands out and gives character to a century-old building.