It was further developed during the reign of Murad II (between 1421 and 1451), when Hundi Fatma Hatun, daughter of Bayezid I, built the complex's first mosque.

[2][3] The mosque and mausoleum stand on opposite sides of a long courtyard with large şadırvan (ablutions fountain) at the entrance.

A wooden arcade with pointed arches wraps around the courtyard and rises to form portals with tall domes in the bays leading into the buildings.

[5] The mosque, to the south of the courtyard, is a tall single-unit prayer hall of masonry construction with two minarets at the northern corners.

[5] Hundi Hatun, the wife of Emir Sultan and daughter of Bayezid I, was responsible for the hamam to the south of the mosque.