The ground floor was completed in 1831, while in 1839, the Gothic pastry shop called "Pedrocchino" was built. During the "Fourth Congress of Italian Scientists" in 1842, the rooms of the upper floor were inaugurated. Japelli collaborated with the engineer Bartolommeo Franceschini and the architect Giuseppe Petrelli, to whom we owe the merger of the balustrades of the terraces with the griffins. The painter Giovanni De Min, helped decorate the Greek room; Ippolito Caffi, the Roman room; Pietro Paoletti, the Pompeian room (or "Ercolana"); Vincenzo Gazzotto, painted the ceiling in the Renaissance Room.