It was built by Silahtar Seyyit Mehmet Pasha in 1778-1779 in Gülşehir. It is written in the charter of Karavezir that the architect of the mosque was Ebubekir Veledi Halil Efendi, who worked with eight akçes per diem.

The mosque, which has the characteristic features of Ottoman architecture, is made of two-color cut stone, square planned, 11 m diameter dome covering the main space is seated on four arches. The dome sits on the main walls with four pointed arches and pendentives at the corners. The dome is partly carried by the corner towers and piers, and partly by the arches.

Source: http://www.turkiyenintarihieserleri.com/?oku=2313