The Mosque of Gamal EI-Din El-Ustadar locates few meters downward Bab El-Nasr Street and in front of the Sabil-Kuttab and Wikala of Oda Basha. It is mainly a complex that involves a Sabil standing on the right side from the entrance and opposite to the Qibla Aisle, and a tomb next to the entrance also. The complex was restored after the great damage that it suffered from because of 1992 earthquake. The mosque-Madrasa was established by Emir Gamal El-Din Ustadar, one of the prominent characters at the time of Sultan Farag Ibn Barquq who is credited to erecting many buildings in the area of El-Gamaliya that is called after his name.
Few years later, he was executed by the Sultan who was going to destroy all the buildings established by him but for the efforts of the Qadi who suggested erasing his name only. On either sides of the façade, appears a number of stalls that were used to provide money for the upkeep of the mosque. The interior plan of the mosque is typically designed as a central courtyard surrounded by four aisles and was used as a school for the main four Islamic rites' schools. Of special interest in this mosque is the rich style of decoration that is highlighted by the beautifully colored panels and the walls that are handsomely ornamented with small pilasters. The Mihrab is remarkably standing in the northwest aisle that is distinguished by its depth. The beauty of the building is accentuated by the awning that was used as a means for preventing the rays of the sun from affecting on the interior plan and annoying the people during the noon prayer.