Where was Léon: The Professional filmed

Léon: The Professional was filmed in New York in the United States of America.

Roosevelt Island Tramway

In movie

Scene where Mathilda takes the Roosevelt Island Tramway.

Real

New York

East 42nd Street

In movie

Scene where Leon is looking at the city he is living in.

Real

Scene was shot The Chrysler Building is an Art Deco–style skyscraper located in the Turtle Bay neighborhood on the East Side of Manhattan, At 1,046 feet (318.9 m), the structure was the world's tallest building for 11 months before it was surpassed by the Empire State Building in 1931.
New York

The landing in front of Leon and Mathilde's flats.

In movie

Scene where Léon and Mathilda meet for the first time in the hallway of the building they both live in.

Real

Scene was shot in New York's famous Chelsea Hotel, it was the area in front of Leon and Mathilde's flat that was filmed. The director was primarily attracted by the wrought iron part of the railing.
New York Hotel Chelsea