There is a plain area where the Theater, Temple of Demeter and Kore, Gymnasion and the Gymnasion Bath is located on the southwestern part of the city. This area was created with the help of a very long terrace wall. Important public buildings on this terrace are protected from northern winds. One of these, the Gymnasion, is located in the southeast of the Theater. It is surrounded by two stoai from the east and south directions. The double-faced columns of the south stoa dated to the 2nd century BCE have palm capitals. These columns with palm capitals may have been erected as votive offerings. The columns on the front are in Doric order similar to the stoai of Hellenistic Pergamon. The 1200 m2 area between the stoai must have been used as a Palaestra.

The debris at the northern end of the Palaestra, at the south of the Theater, was identified as a temple by German researchers. The debris points to a large-scale public building similar to a temple. A temple inside the Palaestra area seems unlikely and the structure in question could be an Ephebeion.

The bath structure is located at the east of the Gymnasion and Palaestra on the southwestern terrace. Due to its proximity to the Gymnasion, the building is named as the Gymnasion Bath. Based on the observations on the area where excavations were not carried out, the plan of the building could be determined to a great extent. The main entrance of the building faces south.

The 60 m long bastion wall that had been interpreted as the southern extension of the terrace wall of the Theater is actually the western terrace wall of the Gymnasion. The Theater terrace ends by this structure. Important public buildings on this terrace are protected from northern winds. The Buildings in Aigai 60 Three parallel, vaulted corridors oriented in the northsouth axis are located at the south entrance of the bath. The eastern corridor at right, opens directly to the palaestra. The other two corridors lead to the parts of the bath. The floor of the bath structure was on a thick layer of plaster of about 20 cm used for insulation purposes. The workmanship on the well-preserved west wall of the building, the use of mortar together with the anathyrosis in the corners, indicates the transition from the Late Hellenistic Period to the Early Roman Period. The bathhouse must have been built with the contributions of Emperor Tiberius, who provided important help to Aigai after the earthquake in 17 CE.