Hôtel de Maisons, Private mansion in 7th arrondissement, France

The Hôtel de Maisons at 51 rue de l'Université is an early 18th-century private mansion begun in 1706 to plans by Pierre Cailleteau, known as Lassurance. From the street, a pale yellow stone gateway with two round columns frames a dark green double door carved with circular relief motifs and fitted with a brass ring handle; two red plaques flank the base and a small black plaque reads "51".

François Duret, president of the Grand Conseil, had the hôtel built from 1706 on plans by Pierre Cailleteau, known as Lassurance; it was nearly finished in 1707 when Claude de Longueil, marquis de Maisons, bought it and demanded major changes. The interior was reworked in 1749–1751 by Pierre Mouret for the marquis de Soyecourt, and the gateway dates from 1783–1784. It was listed as a monument historique on 11 June 1926.

The house carries several names: hôtel de Maisons after Claude de Longueil, marquis de Maisons, who bought it in 1707; hôtel de Soyecourt after the marquis de Soyecourt, who had the interior remodelled in 1749-1751; and hôtel Pozzo di Borgo after the family that reworked it in the 19th century. Karl Lagerfeld rented the west wing from 1978 until the 2010 sale.

The mansion is a private residence at 51 rue de l'Université, in the 7th arrondissement, and cannot be visited inside. From the pavement you see the street front: a pale yellow stone gateway with two round columns, a flat entablature and cornice, and a dark green double door with carved circular motifs and a brass ring handle. Two round red plaques flank the door, and a small black plaque reads "51".

The portal on the street dates from 1783–1784 and was long attributed to Claude-Nicolas Ledoux. The building was divided into flats in the second half of the 20th century and had 16 co-owners, among them Philippe Pozzo di Borgo, before its 2010 sale. Karl Lagerfeld rented the west wing from 1978.