Hôtel Grou, Neoclassical private mansion in Ile Feydeau, Nantes, France

The Hôtel Grou is a neoclassical private mansion at the corner of Kervégan Street and Petite-Hollande Square, built with limestone and granite. The building features two separate entrances, one on the square and the other at number 32 Kervégan Street.

Guillaume Grou, a ship owner and royal secretary at the Parliament of Brittany, had this private mansion built between 1747 and 1752. The construction reflects the rise of maritime wealth and merchant power in Nantes during that period.

The west facade on Place de la Petite-Hollande was the private mansion of Guillaume Grou, while the part entered at 32 rue Kervégan was a rental building, making it one of the most complex structures in the district. The ground-floor entresol, intended for shops, has five mascarons above its openings, and the central opening was once a carriage gate leading to the courtyard.

The building stands at the western tip of Île Feydeau, where Rue Kervégan meets Place de la Petite-Hollande. The west facade faces the square, while the rental part is entered at 32 Rue Kervégan. The ground floor is occupied by a bar-brasserie, so the arched openings and the iron balconies above are best seen from the public street and square.

The west facade on Place de la Petite-Hollande was the Grou family's private house, while the section entered at 32 rue Kervégan was built as a rental block, making the building one of the most complex in the district. The 1932 listing covered facades, ironwork and roof; the 1986 one covered the interior stairwell.