The Süleymaniye has four minarets, placed at the corners of the courtyard, north of the mosque. Two of them have two balconies, the two other have three.
In Süleyman’s day a choir of some 250 muezzins climbed to chant the call to prayer from the ten galleries of the four minarets (25 on each balcony!).

Correspondent: J.M.Criel, Antwerpen.
Source: ‘Insight Cityguides: Istanbul’ – Apa Publications, 1989.