Various architectural additions were made to the building over time, lending it a diverse architectural feel. The halls of the palace are decorated with frescoes from the 15th, 16th and 17th centuries. The next residence along on via Fratelli Bandiera, once a property of the Arrivabenes, boasts a vault of frescoes by Giuseppe Bazzani. The square courtyard, which can be reached by passing through an 18th century doorway, is Fancellian in its design, with 15th century capitals in the loggia, while the remaining decorative elements in the courtyard can be attributed to Geffels. At the corner between the two streets, a marble pillar bears the symbol of a serpent wrapped around a spear, while an epigraph testifies to when the place was founded: "concertedly, the brothers Giovanni and Giovan Pietro Arrivabene, on their own behalf and on the behalf of their dear son Alessandro and their grandchildren, residing at this house laid its foundation in the year 1481 A.D..."