58 Joralemon Street

58 Joralemon Street, in Brooklyn Heights, Brooklyn, New York, United States, is a Greek Revival structure built in 1847 as a private residence but is now a New York City Subway vent.

The Interborough Rapid Transit Company acquired the property in 1907,[1] gutted the interior, and converted the structure to "the world’s only Greek Revival subway ventilator".

[2] The ventilator also serves as an emergency exit from the eastern end of the New York City Subway's Joralemon Street Tunnel, which carries the IRT Lexington Avenue Line (4 and ​5 trains) between Bowling Green and Borough Hall, where it becomes the IRT Eastern Parkway Line (2, ​3, ​4, and ​5 trains).

[3] Through acquisitions, the property passed to the New York City Board of Transportation in 1940 and to the New York City Transit Authority in 1953, its current owner.

[4] The exterior facade and black Lexan windows are the result of a 1999 agreement with the Landmarks Preservation Commission to help the facility blend into the neighborhood as a fake building, which is a city-landmarked historic district.