Hôtel de Sagonne, Private mansion in Quartier de l'Arsenal, Paris, France.

The Hôtel de Sagonne stands at 28 rue des Tournelles and 23 boulevard Beaumarchais. Its sober stone street facade reflects the modest rank of Jules Hardouin-Mansart in 1667-1668, while the garden side was more ornamented, with pediments, reliefs and a wide balcony on columns at the first floor. The building is now divided into apartments.

Jules Hardouin-Mansart built this house in 1667-1668 with his brother Michel, contractor, on the occasion of his marriage to Anne Bodin on 3 February 1668. From 1686 he lavishly decorated it after becoming first architect to the king in 1681 and count of Sagonne in 1699. It was enlarged in 1690-1692 into three houses, one of which housed his brother-in-law Robert de Cotte.

The name comes from the land of Sagonne in the Cher, which Hardouin-Mansart acquired when he was ennobled in 1699. From 1686 he had the interiors painted by Michel Corneille the Younger, Jean-Baptiste Corneille, Charles de La Fosse and Étienne Allegrain, with sculpture by Martin Desjardins; he became protector of the Royal Academy of Painting and Sculpture in 1699. The allegorical paintings were uncovered in 1924 beneath false ceilings.

The mansion is divided into private apartments and cannot be visited; only the street facades on the rue des Tournelles and the boulevard Beaumarchais are visible. The sober stone front on the rue des Tournelles faces the street, while the garden facade with its pediments and first-floor balcony on columns lies behind the gate and is not accessible. The wrought-iron gate and fence are seen from the public way.

The painted allegorical decorations were rediscovered under old false ceilings and uncovered in 1924. The hôtel was divided into apartments in the mid-20th century, and decorator Jacques Garcia occupied the first floor in the 1980s and 1990s. A legend long held that the architect Mansart de Sagonne owned it, but it belonged only to his father, the count.