English: Strolling through Istanbul, guidebook, points out that “In the centre of the west wall opposite the mihrab is a small balcony supported on sic columns, and behind this rises very unusually the single minaret, which is thus in the middle of the west façade”. This matches a description on Archnet: “The muezzin's platform, located just behind the minaret wall, has a better placement than is usually found in single-domed structures. This platform is supported by pointed arches that rest on six slender columns. The sequential layout of the muezzin's platform and the minaret strengthens the emphasis on the qibla axis.” I conclude the balcony mentioned first is a muezzin’s platform.