From the information board at the site: In many ancient cities, the Buleuterion (an assembly hall, mainly used by the city council) and the Prytaneion (the offices of the main magistrates, the prytanes) were close to each other.

The Buleuterion (built about 200BC) was almost square, and could accommodate some 500 people. The length of the roof beams seems to have caused problems, and later they had to be supported by pillars set on the seats. The central altar with the busts of gods carved in relief, as well as the seats in the external alcove on the south side and further to the north belong to later building phases.

The Prytaneion was, among other things, where the sacred fire was kept, and was used to entertain official guests and honorary citizens. The visible remains are laid out like a courtyard house, and date to the Roman imperial period.