Where was The Professional (1981) filmed?

1981 film by Georges Lautner

The Professional (1981) was filmed in Boulogne-Billancourt, Château de Maintenon and Résidence Salmson Le Point du Jour, 3 places named in its Wikipedia article, in France. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data