Park Avenue

The Park Avenue Viaduct, also known as the Pershing Square Viaduct, is a roadway in Manhattan in New York City. It carries vehicular traffic on Park Avenue from 40th to 46th Streets around Grand Central Terminal and the MetLife Building, then through the Helmsley Building. All three buildings lie across the north–south line of the avenue. The viaduct itself is composed of two sections: a steel viaduct with two roadways from 40th to 42nd Streets, as well as a pair of roadways between 42nd and 46th Streets. The section from 40th to 42nd Streets was designated a New York City landmark in 1980 and was listed on the National Register of Historic Places in 1983. The street-level service roads of Park Avenue, which flank the viaduct between 40th and 42nd Streets, are called Pershing Square.

The viaduct was first proposed by New York Central Railroad president William J. Wilgus in 1900 as part of the construction of Grand Central Terminal.