|Summary:||Rectangular building; in the Sanctuary of Apollo, on the north edge of the sanctuary, east of the Theater.|
|Date:||ca. 450 BC|
ca. 20 m x 10.25 m.
Rectangular hall with a door in the middle of the southern side. Two rows of 4 pillars supported the roof; there may have been an opaion above the 4 central pillars.
A club house and also served as a gallery, decorated with paintings by Polygnotos. It may also have served as a dining room.