The Sheikh Ali Mosque was commissioned by Yazıcı Ali Ağa in 1824 (1240 AH). It holds a special place among the mosques in Sinason (Mustafapaşa) as the only structure whose original inscription and founder are known. Built entirely of smooth, yellow-colored cut stone, the mosque stands out for its sturdiness and simplicity. The glass-enclosed section added to the building’s facade at a later date has partially altered its original appearance.
Originally built as a single-bay structure, the mosque has, over time, acquired a five-bay layout as a result of later additions. The sanctuary consists of a single nave perpendicular to the mihrab and is covered by a pointed barrel vault. The marble-clad mihrab is one of the most striking elements of the interior. The entrance, located on the northern edge of the eastern facade, stands out for its aesthetic and decorative features. Medallions featuring wheel-of-fortune and rosebud motifs on the arch lintel add an elegant touch to the building’s decorative scheme. The four-line Ottoman Turkish inscription immediately above the entrance clearly states the mosque’s history and its patron.
The inscription states that the mosque, commissioned as a charitable endowment by Yazıcı Ali Ağa, was completed in early Muharram of 1824. The inscription also calls for prayers for the souls of both the patron and his father, highlighting the building’s spiritual dimension.
The mosque’s original minaret is of the pavilion-style and is situated at the southeast corner of the building. This architectural feature indicates a commonality also seen in other mosques in the village (Camii Kebir and Sipahi Mosque).