Andreani presents the side of the Palazzo della Ragione overlooking the Rotonda di San Lorenzo. Here are the first steps of the wide staircase, which still today leads to the inside hall. Between the Palazzo and the Rotonda there was a house that Andreani demolished in 1943, making the upper level accessible, and highlighting the medieval contour with its three arches, still standing after the many demolitions that had taken place in the course of time.