Oak Parkers should take a moment to notice the unique building. Designed by Charles E. White, Jr. So sturdy is the building that it is expected to last another 200 years. The floor and walls in the lobby and upper balcony are marble. The panels throughout the building are oak and the workroom floor is hardwood maple.
Lighting fixtures are brass and banisters are bronze.
The decorative window casements are aluminum and bronze. The Oak Park post office was built around the same time that the Evanston post office and the main branch of the Chicago post office were constructed. Johnson was a native of Oregon, Illinois who had come to Chicago to study at the Art Institute. At the time he was commissioned to do the four pictures, he was living in New York City. Each picture depicts a scene of history significance to Oak Park.