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From Charles-de-Gaulle airport

Take RER B direction Saint-Rémy-lès-Chevreuse or Robinson.
Get off at the Gare du Nord station.
Exit the station Rue de Dunkerque and walk up the street to Boulevard Rochechouart.

From Orly airport

Take the Orlyval shuttle to the RER B – Antony station.
Take RER B direction Charles-de-Gaulle airport.
Get off at the Gare du Nord station.
Exit the station Rue de Dunkerque and walk up the street to Boulevard Rochechouart.