Nalbastı Hacı Mehmed Ağa Mosque, which was built in the 16th century as a foundation work, was built of cut stone material. The square-planned building has a three-celled last congregation place covered with a flat ceiling. The square-planned harim section is divided into three courts with two rows of pointed arches perpendicular to the mihrab. In the harim section which was designed as two-storey structure, a U-shaped second floor was added with a wooden construction. The structure has a flat wooden ceiling from the inside and is covered with a hipped roof from the outside. The upper floor of the entrance to the harim section is reserved as muezzin place. The minaret in the northwest of the building is made of cut stone material and has a single balcony. Nalbastı Hacı Mehmed Ağa Mosque attracts attention with its interior decorations. Especially the geometric and floral pencil decorations on the ceiling of the gathering place section are remarkable.