The A. J. Clark Store is located at 286 Main Street in downtown Cornwall. Archer Clark built the Italianate building to house his butcher shop around 1875, after an 1870 fire destroyed his earlier quarters. It would continue in existence in that building for a century. Later, one of his descendants converted it into a delicatessen. In 1996 it was added to the National Register of Historic Places as an intact commercial building dating from Cornwall's days as a summer resort town in the late 19th century.