In 1543 Alessandro Vitelli obtained permission from the municipality to extend his mansion on the south side up to the town wall.
With the extension of the main reception hall and the construction of two new rooms (IX and X), a part of the exterior decorations was incorporated inside the new rooms.Considerable traces of the exterior mural decorations done by Cristoforo Gherardi and his assistants are visible today in hall X. On the ceiling visitors can see a design with dolphins which is probably the most authentic part of the entire mural decoration.

Hall 11
The Main Reception hall. The Main Reception hall was built, along with halls XI and X in 1543 when Alessandro Vitelli expanded his mansion. Two separate decoration phases are to be seen on the walls of the main hall: one done by Cristoforo Gherardi and assistants in 1537 and the other by Cola dell'Amatrice and assistants after the enlargement of the mansion in 1543. To Cristoforo Gherardi we must attribute the east and north walls with animal designs, landscape in the central section, and above, almost entirely lost due to later decorations painted over them historical subjects monochromatically represented. The subjects of the second phase by Cola were identified by Guerrini as Hannibal, Scipione, Caesar and Alexander the Great. Unsurprisingly, the heroes of Alessandro Vitelli and at the same time subjects very much in fashion in the city mansions and country villas of the Roman nobility. According to Guerrini the subjects of mural decoration in that period tended to represent events in the life of a person or a family. In the center of the hall there are two large tables of the XVIIth century in carved walnut. According to local tradition, they were originally in the meeting hall of the San Francesco monestery. They are of central Italian origin, possibly the work of local artisans.