The Basilica is sometimes mistaken for the Nymphaeum and vice versa. Of the basilica a large hall to the north is the most imposing, though a large part of the western wall is stgill standing also, stretching south.

Regarding the hall I have been informed: "In the monumental hall at the north end of the basilica official or legal business was carried on. It is rectangular in plan (20 x 14½ m), and still 15 m in height. It was built of huge conglomerate blocks, with walls of two meters in thickness. There is one arched door on the north side, and three on the south side, which led through into the basilica. Inside the building, on the east and on the west walls, there are three niches each; the middle niches are large and vaulted. Statues of emperor Hadran and of a Roman woman (now in the Antalya Museum), were found in the vicinity of the building, and it is most probable that they were placed in these niches.
This hall must therefore date from around the early 2nd century AD." (Source: ‘Aspendos, a travel guide’ – Edip Özgür / Antalya Müzesi. 1988. )

The fine site Livius.org has slightly diffgerent dates, stating: "This building is more than 100 meters long and 25 meters wide: about the size of the basilica of a much larger city like Carthage. It was later converted into a church."