The Post Office building is an arcaded block building, featuring a series of evenly spaced, round arched window openings. It is a commercial style that was popular during the early 20th century, and was derived from the great arcaded porches built in Italy during the Renaissance.
The gargoyle waterspouts and decorative detailing are fashioned in terra cotta. James Wetmore was the supervising architect. The building now houses SciTech, an interactive science and technology center with over 200 hands-on exhibits.