The corner building, the last of those on the left-hand side of the square, is characterised by a Renaissance style, underlined by the four-part cross windows and a lively colour scheme.
Loosely inspired by the late 15th-century renovation of the Ozegna Castle, it re-proposes the richly coloured decoration of Manta Castle, near Saluzzo; the building, located at the exit of the Borgo towards the River Po, features exposed brickwork and has windows on all sides decorated with terracotta reliefs and brightly coloured paintings. The coat of arms of the San Martino family stands out on the far right.
The most interesting part of this building is that on the Po River side, borrowed from the castles of Rivara, Ozegna and Settimo Torinese: on the ground floor, beyond the portico, was a large hall used as the dining room of the San Giorgio restaurant which, for a short period (1912-1927), housed the Museo regionale di architettura (Regional Museum of Architecture), and then was again used as a dining room from the 1930s until 2004, when the restaurant was closed.