Off-Market Property Search: Confidential Sourcing of Exceptional Homes

The hidden market, accessible by invitation only. A bespoke, confidential search with no public intermediaries.

Off-market property search involves identifying, negotiating, and acquiring exceptional homes never listed with agencies or on portals. In France, nearly 60% of luxury transactions above €3M are concluded this way, in complete secrecy. Adopte une Conciergerie leverages a network of deal introducers, notaries, and family offices to open these confidential opportunities to investors: private mansions, castles, architect-designed villas, wine estates, Parisian penthouses. Each mandate is exclusive, written, and conducted with absolute discretion.

In-depth analysis

What is the off-market luxury real estate market?

The off-market — or "hidden market" — refers to properties offered for sale without public advertising or exclusive mandates displayed in windows.

In the ultra-luxury segment, over 60% of transactions occur this way. Sellers (high net worth individuals, heirs, executives, celebrities) demand absolute discretion to protect privacy, market price, and ongoing negotiations.

Accessing this market requires a dense network built over at least ten years, including notaries, family offices, wealth management advisors, private agents, and property dealers.

Our proprietary 5-step method

1. Confidential client briefing — property type, budget, tax considerations, timeline, wealth management objectives.

2. Exclusive sourcing — activating our network (notaries, family offices, partner agents) over 4 to 12 weeks.

3. Document pre-qualification — diagnostics, planning, co-ownership, taxation before any visit.

4. Private viewing and second opinion — accompanied by architect, construction economist, tax expert if needed.

5. Pure buyer negotiation — exclusive representation, never dual mandate, suspensive conditions, signed timeline.

Why choose an exclusive search mandate?

The exclusive search mandate is the key to serious off-market hunting. It guarantees your advisor works for YOU — the buyer — and not the seller.

It excludes dual mandates (in France, the agent holding the property represents the seller). It allows hours of sourcing without risk of you buying elsewhere simultaneously. Fees are fixed (usually 3 to 5% excluding VAT of the net seller price, capped).

It also signals seriousness to notaries and family offices who only open their off-market files to mandated buyers.

Fees, timeline and guarantees

Fees: study flat fee (covered upon transaction) + success commission 3 to 5% excluding VAT, capped according to deal size.

Average timeline: 8 to 16 weeks between mandate signing and preliminary contract.

Guarantees: contractual confidentiality (bilateral NDA), weekly reporting, right of withdrawal at any time, full refund of flat fee if no suitable opportunity is presented.

Priority areas of operation

Grand Est — Strasbourg (Golden Square, Orangerie, Robertsau, Contades), Colmar (Little Venice), Metz (Historic centre), Nancy (Place Stanislas), Reims, Alsace Wine Route.

Côte d’Azur — Cannes (La Croisette, La Californie, Super Cannes), Saint-Tropez (Les Parcs, Les Salins, Citadel), Cap d’Antibes, Monaco.

Alps — Chamonix, Megève, Courchevel, Val d’Isère, Verbier.

Île-de-France — Paris (Golden Triangle, Saint-Germain, Marais, Monceau), Versailles, Saint-Cloud.

Europe — Prague (Malá Strana, Vinohrady), Geneva, Brussels, Lisbon.

Our key engagements

Off-Market Property Search: Confidential Sourcing of Exceptional Homes

Exclusive network of notaries, family offices, property dealers and private agents

Exclusive buyer search mandate — never dual mandate

Absolute confidentiality — systematic bilateral NDA

Urban planning and tax pre-qualification before any visit

Capped fees conditioned on success

Frequently Asked Questions

Everything you need to know before your project

How much does a luxury off-market search cost?

Fees generally consist of a study flat fee (€3,000 to €8,000 excluding VAT, deductible) followed by a success commission of 3 to 5% excluding VAT of the net seller price, capped for deals over €5M. Everything is formalised by a written mandate before the first step.

How long does a confidential property search take?

On average 8 to 16 weeks between signing the exclusive mandate and the preliminary contract. For ultra-rare properties (private mansions in Paris, classified wine estates), the timeframe can reach 6 to 9 months.

Why is an exclusive mandate essential?

Exclusivity protects the buyer: it avoids dual mandates (where the agent already represents the seller), guarantees our team’s 100% commitment, and grants access to off-market files that notaries and family offices only share with trusted mandatary buyers.

Do you work on dual mandates?

No, never. Our ethics forbid representing both buyer and seller in the same transaction. This ensures your exclusive interest in the negotiation.

How do you guarantee confidentiality?

A bilateral NDA is signed at the briefing stage. Visits are by appointment only, without third parties. No identifying information is exchanged via unencrypted email. All our collaborators are bound by strict confidentiality clauses.

Can you assist with tax matters (IFI, usufruct)?

Yes, in partnership with a senior tax advisor and a heritage notary. IFI optimisation, family SCI, usufruct arrangements and donation-sharing are systematically reviewed before the preliminary contract.

Are you specialised in properties over €5M?

Yes. Our core activity ranges from €1.5M to €25M, with occasional transactions beyond (historic castles, classified wine estates). For deals below €1.2M, we refer to our selected partners.