The City of Paris is auctioning off this 19th-century château in Seine-et-Marne
Around thirty curious visitors, investors and property professionals crowded into an abandoned château on a Tuesday in October to tour an estate that has sat empty for three decades, owned by the City of Paris. The auction of the Bellefontaine estate, scheduled for November, is stirring equal measures of excitement and anxiety among prospective buyers.
A 9-hectare estate the city is selling after 80 years of ownership
Located in Samois-sur-Seine, one and a half kilometres from Fontainebleau station, the Château de Bellefontaine is a 19th-century construction. The City of Paris acquired it in 1942, with the intention of using it as a holiday camp for children. For decades, the site fulfilled that purpose before gradually falling into obscurity.
For thirty years, the building has been left to decay. Several restoration projects were launched, but none came to fruition. The city has now decided to take a definitive step by putting the property up for sale. The estate comprises 9 hectares of land and four outbuildings, making it a substantial piece of real estate.
The auction is being managed by the platform Agorastore, represented during the visit by Benoit Koscik, head of auctions. Alongside him, Elisa Guinard, land operations manager for the City of Paris, accompanied visitors throughout the day.
A tense visit caught between hope and technical concerns
The first open visit, held on Tuesday 15 October, drew around thirty people with very different profiles. Some arrived with specific projects in mind; others seemed driven more by curiosity. One couple showed particular interest in the estate’s boiler room, while other visitors were actively searching for a water source on the lower grounds of the château.
A lawyer present during the visit raised questions about which parts of the building could potentially be demolished, questions that reveal the complexity of such a purchase, where architectural and regulatory constraints weigh heavily on any decision to bid.
Tensions also ran high over technical matters. A visitor in checked bermuda shorts, his hair tied back in a ponytail, challenged the representatives of the City of Paris and Agorastore sharply over the absence of a pest survey. He raised the risk of dry rot, a fungus that can devastate timber structures, and threatened legal action for concealed defects after the sale. Faced with the confrontation, Elisa Guinard and Benoit Koscik called for calm.
What prospective buyers need to know before bidding
For any serious candidate, several points deserve careful attention before placing a bid on this property being sold by the city of Paris:
- The château dates from the 19th century and has not been maintained for thirty years.
- The estate covers 9 hectares and includes four outbuildings.
- No pest survey was mentioned during the visit on 15 October.
- The auction is scheduled for November.
- The platform Agorastore is managing the process on behalf of the City of Paris.
Together, these factors paint a picture of a high-potential but genuinely risky acquisition. The absence of a pest survey, raised publicly during the visit, is a major red flag for any prospective buyer.
A piece of Parisian heritage in search of a new future
The Bellefontaine case illustrates the difficulty the City of Paris faces in managing a property portfolio that extends beyond its administrative boundaries. Despite several rehabilitation projects considered over the years, none has succeeded in breathing new life into the château. The decision to sell marks a clean break with eight decades of municipal ownership.
The auction, organised via Agorastore, now gives private buyers the opportunity to take on this historically rich site. The question remains whether the conditions of the sale, notably the absence of certain technical surveys, will be enough to find a buyer willing to take on the full scale of works needed to restore a 19th-century building left untouched for three decades.
