This ninety-foot-long, one-story building sits between the West River and what were the tracks of the West River Railway, facing the former rail depot in the center of the village. Its shed-roofed, trackside loading dock runs the length of its main block, accessing an office and several storage bays. The building was home to a farmers' exchange, part of the national farmers' cooperative movement of the 1920s prompted by the hardship of low farm prices and a shrinking labor pool following World War I. In relatively remote Londonderry, the cooperative ensured that member farmers did not pay a premium for the feed and supplies they required. The cooperative was successful through the Great Depression and into the 1950s. The village as a whole has changed little since then and is listed in the National Register of Historic Places.