Rectangular hall with porches; on the southern side of the Sanctuary of Apollo.
Two-aisled hall with central colonnade of 8 columns, opening onto a porch distyle in antis at the west end and onto a porch of 4 prostyle Ionic columns at the east end.
Used as a club house or guildhall. Dedicated by the Naxians to Apollo. This building replaced an earlier three-aisled hall of the 7th century B.C, which had an entrance on the north. Coulton and Dinsmoor claim an Ionic inner colonnade, Zaphiropoulou believes it was Doric. The prostyle porch on the east was a later addition.
Coulton 1976, 233; Dinsmoor 1975, 142; Zaphiropoulou 1983, 16; via https://www.perseus.tufts.edu/hopper/artifact?name=Delos%2C+Oikos+of+the+Naxians&object=Building