A standout amongst the most huge extensions to the structure is the library worked by Sultan Mahmud I at 1739 between the two supports on the south of the structure. This area comprises of the perusing lobby, the principle place, Hazine-I Kütüb (place where the books are protected) and the passageway and the stony ground joining these areas. It is isolated from the primary spot by a bronze network conveys by 6 segments. The bronze network is improved with blooms and branch convolutions. There is sacred writing of “Ya Fettah” on the two-leafed entryway of the library and there are two entryway handles.
“Ya Fettah” is one of the 99 names of Allah and signifies “the person who opens the entryways of goodness and job and makes things simpler”. It is every now and again utilized on the handles of the entryways in Ottoman Era. There is a porphyry mark of Sultan Mahmud I inlayed to marble on the east mass of the reading room.
The passage consolidating the perusing room and Hazine-I Kütüb (place where the books are saved) is embellished with earthenware production having a place with eighteenth century Iznik, Kütahya and Tekfur workshops with blossom, rose, gillyflower and cypress designs. The wooden book cupboards in the library segment are made of rose wood. The library where Sultan Mahmud I and the main people of the day gave books have roughly 5000 books which have been exchanged to Süleymaniye Library and is safeguarded here under the name of “Hagia Sophia Special Collection” .
There are low, little, limited and wooden tables enhanced by mother-of-pearl trim work system which are utilized for perusing and composing and various two Koran housings covered with mother-of-pearl and tusk.