Constructed in 1883, the Douglass General Mercantile Store is the oldest remaining commercial building in Smithfield and an excellent architectural example of the use of stone, brick, and coursed ashlar in the same building. It was built for William M. Douglass, who had originally opened Smithfield's first general store in his house, and he operated the business until 1897, when he sold it to former employee James Cantwell. Cantwell, one of Smithfield's first school teachers and a longtime postmaster, ran the store until 1910, then sold the building to William Winn and Lorenzo Toolson, who established the Union Mercantile Company. The building has served as the American Legion Hall beginning in 1958.