The building is wide and long, and has a domed Greek cross plan. It is oriented in a northeast – southwest direction. It has 3 polygonal apses, and the narthex has been destroyed. The edifice has no galleries, and the dome, which has no drum, is almost certainly Ottoman, although the arches and the piers which sustain it are Byzantine. The arms of the cross, the pastophoria, the Prothesis and Diaconicon are covered with barrel vaults, and communicate through arches. The north and south walls have a floor level with three arcades, a first level with three windows, and a second level with a window with three lights. On the southeast side, the three apses project boldly outside with three sides. The roof, the cornice and the wooden narthex, which replaced the old Byzantine narthex, are Ottoman. A cruciform font which belonged to the baptistery of the church and lay on the other side of the street has been moved to the Istanbul Archaeology Museum. The dome piers, which form the internal side of the cross, are L-shaped. They are an example of the stage preceding that of the cross-in-square church with four columns. Remains of frescoes placed on the south side of the building have been published. Moreover, during the floor renewal in the 1990s, several tesserae have been found, showing the previous existence of mosaics panels and frescoes in the building. Despite its architectural significance, the building has never undergone a systematic study.