According to waqf records, the Hasan Ağa Mosque was built in the second quarter of the 16th century by Hacı Hasan Ağa, who served as the chief doorman under İskender Pasha. Located in the Çarşı Neighborhood at the intersection of Mahmut Goloğlu Street and Sakız Meydanı Street, the building features a terraced layout due to the slope of the site on which it was built, with shops on the lower level. The fact that the neighborhood is referred to as “Hacı Hasan” in the cadastral surveys dated 1553 and 1583 confirms the information in the endowment records.
The mosque has a pentagonal plan, is constructed of roughly hewn stone, and has a gabled roof covered with grooved tiles. The building is accessed via stone stairs on the southeast facade. As the mosque lacks a minaret, the call to prayer was recited from a balcony opening onto the gallery level. The windows on the south facade have flat arches, while the other windows are rectangular. All windows have stone jambs, iron grilles, and wooden sashes. Entry to the prayer hall is through an iron door with a round arch and stone jambs. To the right of the entrance, a wooden staircase leads up to the women’s gallery.
The ceiling and floors of the prayer hall are made of wood. The walls are paneled with wood up to the parapet level. The stone mihrab, painted with white oil paint, bears traces of the Baroque style. The mihrab, featuring a rounded niche, a segmented dome, and columns, is decorated with curving leaves, rosette flowers, and fan motifs. The wooden minbar located to the right of the mihrab was likely added to the structure during the most recent restoration. As a structure primarily used by artisans for prayer, the Hasan Ağa Mosque does not have a pulpit. The mosque has survived to the present day after undergoing restorations in 1973 and 2006.
The building’s construction inscription has not survived to the present day. However, there is a plaque on the minbar bearing the date of the restoration:
The owner of this minbar, who will intercede for the people on the Day of Judgment, is Muhammad 1302 H/1885 M.