On the south side of the second courtyard, beside the Birri Tower, is a building dating back to the second half of the 12th century which was modified in later centuries.
The rooms on the ground floor are used to display the collection of wrought iron objects. On the first floor, which is accessed by passing through the 16th century loggia and the Guard Room, is the Flower Room, decorated with floral friezes dating back to the 15th and 16th centuries.