Hôtel Montholon, Private mansion in 2nd arrondissement, France.

The Hôtel de Montholon stands at 23 boulevard Poissonnière, its light grey stone facade set slightly back to create a first-floor terrace. A colossal order of Ionic pilasters divides the upper floors, where tall windows with wrought-iron railings sit beneath a grey mansard roof with dormer windows. The ground floor retains a dark green scalloped awning.

Built in 1785 by François Soufflot le Romain for the wife of Nicolas de Montholon, president of the Normandy parliament, the design was entrusted to Jean-Jacques Lequeu, inspired by the Hôtel Benoît de Sainte-Paulle (1773). Charles Sallandrouze de Lamornaix later used it as a warehouse and shop for his Aubusson and Felletin carpet factories. In 1868 Edmond Adam and Juliette Lamber moved in; the house, bombed during the 1851 coup, became a republican symbol. It was listed as a monument historique on 9 January 1926.

The ceiling of the salon de compagnie was painted by Jean-Baptiste-Claude Robin with Themis, accompanied by Force and the Genius of Laws. The room later hosted Juliette Adam's salon, which from 1871–1872 became one of the most important of the Third Republic, drawing left-leaning men and later composers such as Gounod, the painter Léon Bonnat and the novelist Pierre Loti.

The protected facade along Boulevard Poissonnière and the decorated interior rooms are the main features visitors should note. Since this remains a private residence, viewing is limited to exterior observation or occasional special events.

During the 1800s, the residence became home to an important Parisian salon hosted by Juliette Adam. She gathered politicians, military officers, artists, and writers who shaped the cultural and intellectual conversation of her era.