The arched cellar of the building, which was completed according to a project drafted by Baltic-German engineer
Ernst Boustedt in 1908, was space for salt storage. The Salt Storage was reconstructed in 1995–1996 according to a project by architect
Ülo Peil and interior architect
Taso Mähar (both from the architecture bureau Urbel & Peil). During the course of this reconstruction, the structure – which was originally a single storey – was divided into multiple floors with an intermediary ceiling and galleries in order to thus offer a greater number of exhibition spaces possessing different characters. == Collections ==