As its Turkish name indicates, it is in the centre of the city, between the Kentriki, Leonidou and Themistokleous streets.

[1] It is a plain, square structure, measuring 8 metres (26 ft) on each side, housing a single large hall and topped by a dome, once sheathed in lead, supported by an octagonal drum.

The entrance formerly featured an impressive portico with four marble pillars supporting four small arches, of which now only a ruined portion survives.

[1] The walls are built of large limestone blocks, but heavy use has also been made of marble spolia from Classical and Byzantine buildings; among the identifiable fragments are inscriptions in honour of Lucius Calpurnius Piso and emperor Nerva, from the local Temple of the Sebastoi.

[2] The grouting of the building's external walls is used in decorative manner, protruding from the masonry.