Located on the Isagarh road at a distance of 4 kilometres from the historic town Chanderi, Koshak Mahal was built in 1445 by Sultan of Malwa, Mehmood Shah Khilji, to commemorate his victory over Sultan Mehmood Sharki in the battle at Kalpi. As suggested by its original name, Kushk-e-Haft Manzil or ‘the edifice with seven-storeys’, it is believed that Koshak Mahal was initially conceptualized for having seven storeys, but the mahal presently has only three storeys and a part of the fourth. Some sources claim that the upper storeys have collapsed with time, while others believe that the project was never finished. According to a widely believed legend, the real reason behind the construction Koshak Mahal was to provide employment to the people of Chanderi as there were facing an acute shortage of work during that time.
Designed like a Roman cross, Koshak Mahal is square in plan with 35.36m side, has arched entrances, one in the middle of each side. The arched passages crossing each other at right angles divide the complex into four quadrants with one mansion in each quadrant. Entirely built of locally available sandstone, all the four mansions of Koshak Mahal are identical in design. Each one is three-storeyed and is three aisles deep on either side, measuring, like a perfect cube. The external simple and plain façade is broken with the protruding balconies at regular intervals. The superstructure of the Mahal has been destroyed. With gorgeous cross vaults, flying arches, sunk arched niches, beautifully carved lotus medallions, and jaali works, Koshal Mahal is an important historical edifice which showcases the architectural practice prevalent during the reign of Sultans of Malwa.