Today only part of it survives: this too, together with the walls, was stripped of its marble in 1887 for the construction of the quays of the port of Constantinople. The mighty retaining wall (analemma) which holds up the tiers (cavea) is made of ashlar blocks alternating with three rows of smooth blocks, and is fortified by two buttresses on its south-east side. The cavea is cut into the side of the hill: the rows of seats (kerkides) were partly carved into the rock, and partly made of stones fastened with mortar.

  The planking of the stage must have originally been supported by two rows of small columns, many of which were subsequently replaced by small piers. One of these bears an inscription containing lists of contributions towards theatrical representations: the text constitutes an interesting testimony of the importance which the theatre had in the public life of Iasos in Hellenistic times.