The interior of the building was made into Baroque style in the mid 18th century. On the ceiling there is Baroque plastering with illusionistic frescoes in medallions. During the last century this building was used for assemblies of the Istrian Parliament and even today the District Parliament holds its formal sessions there, as well as the choir concerts 'Naš kanat je lip' and painting exhibitions 'Annale'. Last spring, in the courtyard behind the Assembly Hall, early Christian floor mosaics were found, probably from the church of S.Thomas the Apostole.