After reading about the mosque I have the impression it's more usual name may be "Kumbarahane Mosque" but both spellings can be found. It was commissioned by the mother of Selim III, Mihrişah Sultan, for Selim’s sappers and gunners and so it was built in the middle of the barracks.

Originally constructed in 1793 with just one minaret, Selim III later added a second. The mosque’s current form was completed between 1803-1804.

Built over an area of 350 square meters, it is also known as the Kumbaracılar Kışlası Mosque, or “Barracks of the Gunners” Mosque. Many of the living quarters which surrounded the mosque, particularly those on the side facing the sea, survive to this day.”

As for the latter, right under the bridge next to the mosque another monumental building seems to be part of those barracks. Towards the sea (that is: the Golden Horn) I only saw empty space, of which one could not take a picture because it was a military zone. The mosque would make a provincial town proud, but is not particular. It is special though in the sense that it belongs to the Ottoman Baroque with touches of the later Rococo. The son would later build the Selimiye Mosque in Üsküdar.