Saadettin Ali Bey Masjid and Mausoleum was built by Ebubekiroğlu Sadeddin Ali Bey in 1241 as a foundation work. The structure, built of cut stone material and consisting of two parts, is composed of a masjid and a mausoleum. The masjid part of the building has a square plan. The square space is covered with a dome carried by squinches. There are decorative elements consisting of various motifs around the triangular mihrab niche. The tomb located to the east of the masjid has a rectangular plan. It is assumed that the original form of the tomb, which is covered with a vault, was in the form of an iwan tomb.