It is within the boundaries of the South Peterboro Street Commercial Historic District.

It was designed and built in 1940, and is one of a number of post offices in New York State designed by the Office of the Supervising Architect of the Treasury Department, Louis A. Simon.

It is a one-story, three bay steel frame building with facades of red brick laid in common bond in the Colonial Revival style.

It features a gable roof crowned by a square, wooden cupola.

The interior features a 1942 mural by Alison Mason Kingsbury titled The Onion Fields.