Ascending the stairs, one enters the second story on the open-air porch, which overlooks the street below through the arcaded parapet. Behind this is the U-shaped outer section of the portico, covered by sloping roof. Beyond this is the inner part of the portico, which consists of five domed bays fronting the prayer hall of the mosque.
The main entrance to the prayer hall is located under the central domed bay of the five-bayed inner portico. The prayer hall is covered by a central dome flanked by double-height wings, which are cloister-vaulted on the northeast and barrel-vaulted on the southwest. The dimensions of the prayer hall are approximately 26.8 by 19.6 meters, with the qibla wall along the longer side. The central dome, with a diameter of 15.2 meters and a height of approximately 22.8 meters, is raised on a cylindrical drum on an octagonal base. This base is supported by eight octagonal pillars placed on the corners of the octagon; four of them partially buried inside the walls, and four of them are free-standing, tied by semi-circular arches. Squinches intervene between the cylindrical drum and the octagonal base, transferring the load to the pillars through muqarnas pendentives. Four semi-domes are placed on the diagonals of the prayer hall. The mihrab is covered with a muqarnas semi-dome. The base of the minaret is embedded in the western corner of the prayer hall. The interior is lit by twenty-four apertures on the drum of the central dome, along with two series of rectangular openings on the walls of the first and second floor and the grille-covered openings located within the tympanums of the main arches
The interior of the mosque, and a part of the exterior northwestern elevation of the prayer hall, are clad with colored Iznik tile panels decorated with floral arabesques. Red and white stones form the arches supporting the central dome and the slightly pointed arch that crowns the wooden doorway of the main entrance. The roofs of the side wings are decorated with wooden colored reliefs organized into geometric patterns. Floral frescoes decorate the center of each dome, while Thuluth inscription plaques are placed above the doorways, and medallions with Arabic inscriptions are situated between the arches of the external portico and on the squinches.
On the lower level, the nine arches of the northwestern facade lead onto nine vaulted shops. Behind these are two barrel-vaulted stores under the double porticoes.
The mosque was damaged by fire in 1660 and by an earthquake in 1766; in both instances, the damage was immediately repaired. Nineteenth-century Baroque frescoes, layered over the surfaces of the four semi-domes on the sides of the octaglon, were removed during a 1960-1961 restoration organized by the religious foundation. The Rüstem Pasa Mosque was most recently restored between 1964-1969, and now functions as a mosque and monument.
Notes:
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