Notice on site: Firdevs Pasha mosque (also called Architect Sinan mosque). Built in 1561 by Firdevs Pasha, governor of Isparta, in the style of Architect Sinan during the reign of Suleiman the Magnificent. The square-planned and single domed mosque has a five-domed last congregation place (?) on the north and a minaret in the northwestern corner. On the north façade of the mosque there is a cross vault in the middle with a five-division last congregation place, which is covered with domes that have octagonal drums connected to each side with penditives. The roofing system is supported on the façade by pointed arches resting on six columns. The mosque has an entrance on the north side. The mosque has a foundation charter, which is dated 1565 (973 in Muslim calendar). It also takes place among the works of Architect SInan, for it is mentioned in Tezkiret-ül Bünyan, Tezkiret-ül Ebniye and Thuhfet-ül Mimarin (the sources that consist Sinan’s biography and works).

From another source:

On the picture: the platform were women take place if they want to participate in the common prayer. It is situated on the north side of the prayer hall, above the entrance door.

The presence of such a platform in a mosque is not compulsory. The only separation between men and women is during prayers when women must stand behind the men. The platform makes things only somewhat easier (for men); the women being completely invisible for people downstairs, men will no longer be tempted to secretly peep backwards, and so will stay well focused on the ritual.

Correspondent: J.M.Criel, Antwerpen.
Source: Wikipedia.