Prestige Penthouses and Duplexes: Acquisition Consulting

An authentic penthouse meets several criteria: positioned on the exclusive top level of a building (not just a 'high floor'), terrace(s) of significant size (minimum 50-100 m², ideally 200-500 m² with pool and garden), private access (dedicated elevator or private landing), panoramic exposure (ideally 270° to 360°), generous interior volumes (ceiling height > 3 m, XXL bay windows).

A false penthouse is a typical top floor without significant terrace or exceptional ceiling height, sometimes sold with an unjustified premium. Our role is to objectively qualify the property and assess the fair positioning premium (which can represent +30 to +120% compared to the building’s average price per m²).

The co-ownership audit is crucial for a penthouse. Top-floor claims are the most costly: terrace-roof waterproofing (repairs costing €200k-€800k shared with co-ownership), XXL façade renovations (€1M-€3M shared according to shares), elevator (renovation €200k-€500k), premium common areas (24/7 concierge, concierge service). Poorly managed co-ownership can lead to unexpected calls for funds of €50k-€200k over 5-10 years.

Complete 5-year audit: general meeting minutes, accounting (arrears, working capital, ALUR renovation fund), voted and upcoming works, global preliminary technical diagnosis (PTG), energy performance certificate (DPE), multi-year works plan. We appoint a co-ownership lawyer for expert assessment, costing €2k-€5k, potentially avoiding €100k in hidden expenses.

Penthouses have specific technical features: often degraded thermal insulation (old roof terraces), summer overheating (40°C+ without air conditioning), exposure to weather (wind, snow, heavy rain), limited access for works (cranes, material lifts), terrace load limits (pergolas, planters, jacuzzi: tolerable limits 200-400 kg/m² depending on slab), advanced home automation (long wired network, Wi-Fi access points).

We mandate: thermal engineering firm (RE2020 audit), structural engineering firm (terrace load capacity), waterproofing expert, high-end VDI network electrician. The budget for upgrading a 200 m² penthouse + 200 m² terrace: €150k-€600k depending on building age.

Strasbourg: new or recent penthouses in Étoile, Wacken, Kléber districts, around €8k-€15k/m² with terraces 50-200 m². Paris: €25k-€80k/m² depending on arrondissement (8th, 16th, 6th, 7th, 4th Île Saint-Louis), terraces 100-400 m². Cannes: €20k-€45k/m² Croisette, €15k-€30k/m² La Californie. Saint-Tropez: €25k-€60k/m² Les Parcs, port area. Megève: €18k-€40k/m² village centre or Mont d'Arbois. Courchevel 1850: €35k-€80k/m² centre Croisette or Jardin Alpin.

In all these markets, genuine penthouses (with terraces over 200 m² and panoramic views) represent less than 1% of total stock. They often circulate off-market via family office networks, private brokers and specialised notaries. Our role: active sourcing (5-15 off-market mandates per year), shortlisting, audit, negotiation.

Three strategies depending on objective: residential acquisition (focus on emotion, view, quality of life, co-ownership, security; negotiation -3 to -8% vs asking price), rental investment acquisition (focus on net yield, long-term furnished rental 4-6% gross, or luxury short-term rental 6-10% gross), speculative acquisition (buy penthouse to renovate, redesign 6-18 months, resale +20-50%).

For resale, penthouses are liquid products provided they are positioned with premium marketing: professional photography, drone, 4K virtual tour, off-market presentation to a circle of family offices, private brokers, private banks. Average resale time: 6-18 months for penthouses €5M-€15M, 12-30 months for €15M-€40M.