The structure was enlarged within ten years of its original construction and, in 1315, the bell tower was added and in the subsequent year, a great bell was hung there. The upper part of the structure was covered in 1472 and the large hall divided into two rooms, one large and the other small. The larger of the two occupied an area that corresponds approximately to the room known today as the Sala dei Quattrocento. Subsequently, the building functioned as a residence for the Capitano del Popolo, the Podestà and the Signori Sette.