The ancient headquarters of the Notaries' Society - as can be deduced from the three inkwells with goose feathers depicted in the coat of arms on the façade - has undergone different construction phases.
The original nucleus dates back to 1287, however, the left side towards St. Petronio was expanded under the direction of Berto Cavalletto and Lorenzo da Bagnomarino with the collaboration of Antonio di Vincenzo in the design of the windows.
The right part, which is the oldest, was rebuilt by Bartolomeo Fioravanti in 1442. His contribution linked A. Rubbiani during his restoration of 1908 when he restored the two mullioned windows in flamboyant Gothic and suppressed an 18th-century construction of an additional storey. In the interior, Achille Casanova renewed the pictorial decoration of the coffered ceiling based upon documentary sources he'd discovered.