It was built in 1935 and designed by the Office of the Supervising Architect under the direction of Louis A. Simon.

It is a one-story symmetrical flat roofed building in the Colonial Revival style.

The front facade features a central, recessed entrance with broad limestone surround and shallow decorated cornice.

The lobby features a mural by Guy Pene du Bois painted in 1938 and titled "John Jay at His Home.

[1] The building was renamed the Caroline O'Day Post Office on October 23, 2010, in recognition of Congresswoman Caroline O'Day's public service.