he presented a project for the new Église de la Madeleine in Paris, for which he drew inspiration from Jacques-Germain Soufflot's Église Sainte-Geneviève. Though the foundation stone was laid by Louis XV in 1763, funds lagged, and after Contant d'Ivry's death, the plans were modified, then the partially built structure was razed and begun anew. Principal commissions Château de Bizy, Vernon (Eure), for the maréchal de Belle-Isle (ca 1740, partly destroyed). Hôtel d'Évreux, 19 Place Vendôme, Paris : grand staircase and boiseries (1747). Château d'Arnouville at Arnouville-lès-Gonesse, for Jean-Baptiste de Machault d'Arnouville. He collaborated there with Jean-Michel Chevotet, (1751–1757). Palais-Royal, Paris: In 1752 he provided décors for two main rooms, the salle de la section des Finances du Conseil d'État, (notably for the carved fielded panels of its double doors and its ceiling cornice) and the neoclassical salle à manger of the duchesse d'Orléans (now the salle du Tribunal des conflits), one of the earliest neoclassical interiors in Paris. After a fire in 1763, Contant d'Ivry rebuilt the central block, with its facade on the cour d'honneur and the monumental staircase (1765). Château de Saint-Cloud Project for the Abbey and church of Pentemont, rue de Bellechasse at rue de Grenelle, Paris (published 1769). Hôpital général, Valenciennes (1750) The new palace Saint-Vaast d’Arras, Arras. Église Saint-Wasnon, dedicated to Saint Wasnon, at Condé-sur-l'Escaut (1751). Château de Stors (Oise): Chapel for the prince de Conti. Garden designs Château de Chamarande (Essonne).He provided a theater en plein air, an orangerie, a buffet d'eau, belvedere and designs for an ornamental vegetable garden. Château d'Heilly (Somme). Château de Bizy at Vernon (Eure). Château des Conti at L'Isle-Adam (Val-d'Oise). Château de Stors at L'Isle-Adam (Val d'Oise). The park and the monumental terraces. Ekolsund Castle, outside Enköping Municipality, Uppsala County, Sweden. Plan for redesign of the gardens (1757). Furniture designs Console table, gilded wood, c 1750-55; set of four wall lights, 1756. The Getty Center, Los Angeles. Gallery of designs for churches Footnotes Sources Ayers, Andrew (2004). The Architecture of Paris. Stuttgart; London: Edition Axel Menges. . Baritou, Jean-Louis (1987). Chevotet, Contant, Chaussard: un cabinet d'architectes au Siècle des lumières. Lyon: La Manufacture. . Blondel, Jacques-François (1752–1756). Architecture françoise, 4 volumes. Paris: Charles-Antoine Jombert. Vols. 1, 2, 3, & 4 at Gallica. Bourbon de Conti, Louis François de, editor (2000). Les Trésors des Princes de Bourbon Conti. Paris: Editions Somogy. . Braham, Allan (1980). The Architecture of the