Château de Maisons near Paris was designed by François Mansart for René de Longueil, a Parlement of Paris official, who funded it with the inheritance of his late wife. Contemporaries credited Mansart, though the only surviving document naming him is a 1657 payment of 20,000 livres. The text gives 1630 to 1651 for design and construction, but also says the house was in use by 1649, and the 1657 payment points to final completion. The page has no infobox.
The article calls the style French Baroque, with a single-pile plan, raked roofs, tall chimney stacks and a broken facade. It mentions a stone vestibule, wrought-iron grilles now at the Louvre and bas-reliefs by Gilles Guérin.
Bélanger made neoclassical interiors for the comte d'Artois, and work halted in 1782. The state bought the château in 1905, and it became a monument historique in 1914. The article gives no hours.

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