Why buying or selling an exceptional property through a private UHNWI concierge changes everything: data, advantages and method

The fundamental difference is exclusive loyalty. A luxury estate agency — however reputed — structurally works for the seller when it holds the sale mandate. It is incentivised to maximise the transaction price, not to protect the buyer's interest. A private concierge mandated by the buyer has no mandate on the seller's side and no commission linked to the final price. Its interest is identical to the client's. Moreover, it accesses off-market properties that agencies never see — the finest properties are not published.

Yes. This data comes from the Engel & Völkers France Market Report 2026 (January 2026), which notes that in Paris's 7th arrondissement, approximately 40% of properties are handled off-market — a figure reported by Boursorama, MySweetImmo and Presse Agence in their early-2026 analyses. On the Côte d'Azur, the 70% figure for foreign buyers bypassing public platforms also comes from the same Engel & Völkers report. These orders of magnitude are consistent with HomeSelect Paris data citing 15% of transactions above €10 million conducted exclusively off-market.

Via a relational network built over years with notaries, patrimonial lawyers, family offices, wealth managers and local players who signal selling intentions before any formalisation. These sources do not respond to agencies' commercial approaches — they operate exclusively through recommendation and through a history of collaboration. In Grand-Est, Adopte une Conciergerie has built this network since its establishment. Access to these sources cannot be purchased — it is earned over time.

Heritage due diligence comprises seven systematic verifications carried out before any physical visit: (1) property title and complete ownership chain, (2) mortgage situation and debt outstanding, (3) condition of co-ownership if applicable, (4) planning compliance and building permits, (5) energy performance certificate — a G-rated property suffers a 12% average discount according to the Conseil supérieur du notariat, (6) absence of ongoing litigation involving the property or seller, (7) fiscal situation of the property. This inversion of the conventional order (visit first, checks after) protects the buyer against falling in love with properties carrying hidden legal problems.

Our confidentiality architecture rests on four levels: information compartmentalisation (no provider knows the client's real identity unless strictly necessary), reinforced NDA with every participant, data deletion after the mission, and an absolute rule of non-referencing — we never cite a client, even anonymised, in our commercial or editorial communications. Transactions are conducted under working names, payments structured to avoid direct identification, and communications fragmented so that no single interlocutor has a complete picture.

Fee structures vary according to missions and operators. For an acquisition mission, one typically distinguishes fixed mission fees (between €5,000 and €25,000 depending on complexity and target budget) and success fees (1 to 3% of acquisition price). For a confidential sale mission, fees are defined in advance according to the property's specifics and the network mobilised. For comparison: a conventional agency's fees represent 3% to 8% of the sale price, often without the benefits of exclusive counsel, prior due diligence or structured confidentiality.

Absolutely — and it is one of our most frequent missions on the vendor side. We manage the confidential disposal of exceptional properties in Grand-Est: identification of potential buyers in our network (family offices, UHNWIs, institutional buyers), qualified presentation of the property without public exposure, negotiation support, notarial and legal coordination through to signing. The seller only meets pre-selected, financially qualified buyers — never curious parties, speculators or agencies looking to assess the market.

Yes — and it is one of the most distinctive dimensions of our service. According to Sotheby's International Realty (2026), concierge services have moved from premium option to baseline requirement for UHNWI buyers. More than half of luxury acquisitions in 2025 involved secondary or tertiary residences whose owner is absent most of the time. We provide after acquisition: household staff management, stay preparation, works and maintenance supervision, organisation of event rentals during owner absences, and regular reporting on the property's condition. The owner arrives to find their residence always ready — without having managed a single detail remotely.

Châteaux in Moselle and Alsace, classified Grand Cru wine estates on the Wine Route, bourgeois houses in the UNESCO-listed Neustadt of Strasbourg, Orangerie and Contades district properties, architect villas (including works by Jean Prouvé in Lorraine), character farmhouses in the Vosges, prestige residences near Strasbourg's European institutions. These properties share the characteristic of never appearing on public platforms — and representing the rarest and most irreplaceable patrimonial offering on the territory.

Through a confidential conversation — in person, by phone or by encrypted message, as you prefer. We listen first. We ask few direct questions and build a first understanding of your project: nature of the property sought or to be sold, target territory, timeline, specific constraints. On this basis, we present a first outline of method and network access. There is no commitment until you have decided that our way of working matches what you are looking for.