The museum building, built of locally quarried grey Kurla basalt and buff coloured trachyte Malad stone. It is a three-storied rectangular structure, capped by a dome set upon a base, which adds an additional storey in the centre of the building. Built in the Western Indian and Indo-Saracenic style of architecture, the building accommodates a central entrance porch, above which rises a dome, tilled and modified well "tiled in white and blue flecks, supported on a lotus - petal base". A cluster of pinnacles, topped with miniature domes surround the central dome. The building incorporates features like Islamic dome with a finial along with protruding balconies and inlaid floors, inspired by Mughal palace architecture. The architect, George Wittet, modelled the dome on that of Golconda Fort and the inner vaulting arches on those at the Gol Gumbaz in Bijapur. The interior of the museum combines the columns, railings and balcony of an 18th-century "Wada" (a Maratha mansion) with Jain style interior columns, which form the main body of the central pavilion below the Maratha balcony.