In French co-ownership law, the rights of co-owners are clearly separated from the ownership of voting rights in syndicates, which are governed by specific legal rules. A co-owner has the right to challenge the validity of a syndicate decision under article 42 of the 1965 law, but the voting right itself is held by a single person per property. Courts have consistently ruled that both the life tenant and the bare owner—those with different types of ownership interests—retain their status as syndicate members and can challenge a decision, even if only one of them is allowed to vote. This principle was reaffirmed by the courts in Colmar and Aix-en-Provence, emphasizing that both parties can still contest a resolution even if only one was permitted to vote. When co-owners do not designate a common agent to represent them, supplementary legal rules apply. Article 23 of the 1965 law states that in cases of life interest, the bare owner is the default representative, while in other cases of divided ownership, the owner is the representative. The Court of Appeal of Aix-en-Provence clarified that the voting right belongs to the undivided ownership and must be represented by a common agent. This means that a successor agent or a legal representative, such as a curator appointed for an estate, cannot claim the right to vote unless they have explicit authorization from the co-owners or a court. This is especially important when a firm or legal representative is involved in managing an estate, as the mere appointment of a representative does not automatically grant them the right to vote on the co-ownership lot. Parties can agree to a different distribution of voting rights than the default rules, provided they inform the syndicate. Courts have validated clauses in co-ownership regulations that allow the life tenant to represent the bare owner until a common agent is designated. However, certain decisions, such as those involving major works or legal dispositions, are reserved for the bare owner. The Court of Appeal of Toulouse confirmed that if a life tenant is the sole occupant of a property and the bare owners have not objected, the life tenant can be invited to vote without issue. Failure to follow proper representation rules can lead to the entire assembly being invalidated, not just the decisions related to a specific lot. The Court of Appeal of Paris ruled that if a common agent is not properly designated and notified, the syndicate must invite each co-owner individually. This was reinforced by the Court of Appeal of Montpellier, which confirmed that excluding even one co-owner can invalidate the entire assembly. Conversely, when a common agent is properly designated, the syndicate can invite only that agent, and the excluded co-owner cannot claim the invitation was invalid. However, if the co-owners have not agreed on a common agent, the syndicate must invite each of them individually. In cases where a property is divided between a life tenant and bare owners—common in inheritance situations—the legal framework becomes more complex. The default rule, effective since 2020, is that the bare owner represents the life tenant, but this can be changed by a mutual agreement. If the bare ownership is itself undivided among multiple heirs, a common agent must also be designated to represent them. If this is not done, the syndicate must invite each heir individually, increasing the risk of a double failure to invite. For legal professionals, this means carefully verifying the status of the bare ownership before any general assembly to avoid potential invalidation of the meeting. This also relates to the requirement for the notary to notify the syndicate of a transfer of ownership, as long as this has not occurred, the syndicate must still communicate with the deceased owner. Before initiating or defending a legal action regarding the invalidity of a general assembly, it is important to assess several factors: whether the property is divided, undivided, or both; whether a common agent has been designated and notified; whether any alternative representation clauses exist in the co-ownership regulations; whether an implied agency can be established through long-term, uncontested practices; whether all co-owners have been personally invited; and whether the decision falls under article 26 of the 1965 law, which requires direct notification to the bare owner. Additionally, the two-month deadline for challenging a decision under article 42 must be validly calculated, ensuring that the meeting minutes were properly delivered to the correct address and holder. Recent court decisions reinforce that the status of a syndicate member is distinct from the ownership of the vote, which always belongs to a single representative per property. This representative is determined in the following order: a conventional common agent, a clause in the co-ownership regulations, an established implied agency, or the default legal rule. The most critical area of caution for legal professionals involves situations where both division and undivided ownership are present, which are common in inheritance matters. In such cases, two levels of representation must be verified before any invitation is made, as failing to do so could invalidate the entire assembly.