The Missoula Mercantile Warehouse Building was constructed between 1880 and 1900. The walls are made of brick masonry, the floor and roof are framed with wood. Archaic timber trusses span 50 ft. and support the roof structure in one area of the building. Over the years the structure has served in many different roles, from its original warehouse function for supplying wagon trains to a sawmill complete with a stream running through the basement. It also housed the Front Street Theatre and will now be home to the Trail Head, an outdoor gear supplier based in Missoula.