Park Avenue Viaduct

The Park Avenue Viaduct, also known as the Pershing Square Viaduct, is a roadway in the Manhattan borough of New York City that carries Park Avenue from East 40th to 46th Streets around Grand Central Terminal and the MetLife Building, then through the Helmsley Building; all three buildings lie across the line of the avenue.

The viaduct was listed on the National Register of Historic Places in 1983, technically as a "boundary increase" to the Grand Central Terminal's prior listing, but carrying a separate reference number.