321 Irving Avenue is a 2 1/2 story, 3 bay, rectangular plan, wood frame, Colonial Revival, residential building. The c. 1920, side gable roof house has projecting one story end bays, a classicizing entrance with leaded transom and multi-pane sidelights, weatherboard cladding, a block-supported pent roof at the first floor with dentillated frieze, exposed rafter-supported eaves, 6/1 windows on the first floor, and 8/1 windows on the second floor.