A square stone kiosk-mosque (köşk mescidi), the oldest example in Turkey, is located in the middle of the open courtyard. A construction of four carved barrel-vaulted arches supports the mosque on the second floor. The small prayer hall of the mosque contains a richly decorated mehrab (Qibla direction marker), and is lit by two windows.[5] Stables with accommodation above were located in the arcades on both sides of the inner courtyard.