The Sandy Co-op is a two-story, one-part commercial block building constructed in 1889, with a second-story brick addition dating from about 1890, both erected during Sandy's first major period of development, the Mining, Smelting, and Small Farm Era, 1871-c.1910. Its relatively simple design, bilateral symmetry, corbelled brick cornice, alternating rows of dog tooth coursing, and the Sandy Co-op sign panel reflected the aesthetics used on commercial structures in Sandy. It is significant as the only remaining two-story commercial block building from the city's original commercial district. The Sandy Co-op Mercantile and Manufacturing Co. occupied the building until 1908, after which it changed hands several times before the Knights of Pythias purchased and used it from 1912 to 1943. The main floor reportedly served for the sale of general merchandise and the upper floor as a meeting and dance hall. From 1943 to 1984, the building was converted for use as Sandy City's fire station, and in 1988 it was restored to house the Sandy City Museum.