|Summary:||Courtyard surrounded by stoas and rooms; south of the central Sanctuary of Asklepios.|
|Date:||ca. 280 BC|
In the center was a square peristyle court with 16 columns to a side. Behind the northern side of the peristyle was an interior colonnade of 20 columns, and beyond this a long, narrow hall, an ephebeum or exercise room, with a small rectangular exedra (probably a shrine) in its rear wall. Behind the southern side of the peristyle was a wall with doors leading into a long room (probably a dining room) with a central colonnade and 2 rooms at each end. Behind the eastern and western walls of the peristyle were various rooms, the largest on each side having a central colonnade with the one on the east probably serving as a dining hall. An enormous, later propylon on the northern side was the main entrance, with 2 smaller entrances on the eastern side.
Dinsmoor refers to this building as the Palaestra. In Roman times an Odeion was built over the ruins of the Gymnasium.