Measuring 116' x 38' from north to south, this two storeyed brick building is also known as the tahkhana or 'underground chambers' of the Saint Shah Nimat Allah. Located near the mosque and tomb of Shah Nimat Allah, it is thought to have been built as temporary residence for Shah Shuja, Governor of Bengal, who visited the saint often. It is known as 'tahkhana' as the ground floor is built into the western embankment of a large water tank and at the water level while the upper floor is level with the surrounding ground of the mosque and tomb.
The ground floor contains a number of cells. There are seventeen apartments on the upper floor, including two octagonal chambers in the northeast and southeast corner. In one of the chambers on the northeastern corner are the remains of an ornamental fountain. The main apartment leads into a 14' wide covered verandah, with five arched openings on the west, while on its eastern side there is an extremely dilapidated open terrace that partly overlies the flat roof of the ground floor. It is the only flat roof of Mughal period in Gaur that used timber beams overlaid with lime (surkhe) concrete slabs. A domed hammam complex is located on the south with a staircase in the southeast corner that leads down to the water edge. Earthen water pipes are embedded in the walls of the hammam for the supply of hot and cold water to both the hammam and the toilet complex to the south.
Ahmed, Nazimuddin. 1984. Discover the monuments of Bangladesh. Dhaka: University Press Limited, 185,186.