The building formerly belonged to three silk and spices merchant brothers (Rioba, Sandi, and Afani), who relocated from the Peloponnese to Venice around 1112 and then adopted the name Mastelli.

At the bottom right, there is a small fountain made in Arabian style, that, until a few years ago, was used to drink water while staying on the boat or gondola.

On its right side, the level is decorated with a bas-relef representing a turbaned man pulling a laden camel.

The left side window has a bit of Roman altar serving as a thick corner column.

The windows, door frames, balconies, corbels, balusters, cornice, quatrefoils, and the relief of the camel are made of Istrian stone.