Article 815-5-1 of the French Civil Code
Except in the event of dismemberment of ownership of the property or if one of the joint owners is in one of the cases provided for in article 836, the alienation of undivided property may be authorised by the court, at the request of one or more undivided co-owners holding at least two-thirds of the undivided rights, in accordance with the terms and conditions set out in the following paragraphs….