The monument (P1.30.a and 30.b) locally known as Sabekdanga Mosque, is located about 5km due north of the Tomb of Khan Jahan. It is situated in the village of Sabekdanga of the Karapur Union across the Shait Gumbad Road. It is a small curvilinear structure which measures internally 5.6 m N-S and 3.5 m E-W with 1.3m thick walls. The rectangular building was covered by four segmented roof. The building was converted to a mosque by some alterations in different parts. The original entrance in the middle of the southern wall was converted to a window and a new doorway was made in the middle of the eastern wall. Similarly they widened the nich on the west wall for using it as mihrab.

The interior of the monument is profusely embellished with various terracotta floral and plant motifs in which pomegranate fruits hanging from spreading branches worth quoting.
Function of this building, is a matter of controversy. An investigation carried out by the present author in 1993 proved that it was neither tomb nor mosque. Probably it was built as a special prayer chember which is commonly known as Ibadatkhana or Huzra Khana. Recently the monument has been restored by the Department of Archaeology.