Defterdar Mosque Basic information Location Istanbul, Turkey Geographic coordinates 41°02′31″N 28°56′15″E﻿ / ﻿41.042°N 28.9376°E﻿ / 41.042; 28.9376Coordinates: 41°02′31″N 28°56′15″E﻿ / ﻿41.042°N 28.9376°E﻿ / 41.042; 28.9376 Affiliation Islam Country Turkey Architectural description Architect(s) Mimar Sinan Architectural type Mosque Architectural style Islamic, Classical Ottoman Completed 1542 Minaret(s) 1