Comte Le Marois, a great art lover and collector, built Hôtel Le Marois in 1863. His father, General Le Marois, won the favours of the Empire by bravery on the battlefield and was Napoleon I's witness at his marriage to Joséphine de Beauharnais.
The mansion was built on the site of the town house of Marie Duplessis, a courtesan famous for her beauty and intelligence who held a salon attended by the intellectuals and writers of the time. She was the inspiration for La Dame aux Camélias by Alexandre Dumas, fils, and then for the character Violetta Valéry in Verdi's La Traviata.
The mansion remained in the Le Marois family until 1927 when it was sold to the 'Association France-Amériques' founded in 1909 by Gabriel Hanotaux, a French diplomat and a member of the Académie Française, to promote the relations between France and the American continent. Today, it is still a special meeting place for the Franco-American élites in diplomacy, business, finance and the arts.