|Summary:||Rectangular building; in the southeastern section of the Agora, between the Middle Stoa to the north and the South Stoa II to the south.|
|Date:||ca. 150 BC|
38.9 m x 13.8 m.
Rectangular. Stoa-like colonnade opened to the east. Five rooms lined the west wall, all opening west at a lower level than the colonnaded hall. Middle of the 5 rooms had steps and was a passage from the South Square to the colonnaded hall. The 3 middle rooms may have had columns in antis. Southernmost room opened west into the South Stoa II. The East Building was the eastern side of the area known as the South Square.