Buyer in 2021 of a 250 m² pied-à-terre apartment located on the 5th floor of a fine building in Paris 16th, our client is suffering massive ceiling infiltrations in two of her bedrooms, apparently coming from the maid's rooms located on the floor above.

After fruitless investigations, she mandates us to conduct advanced research on her behalf, contacting neighboring owners/tenants to identify/resolve the issues.

In-depth diagnosis (endoscopic cameras, humidity tests, ultrasounds) reveals a non-watertight bathroom in a neighboring owner's unit (lack of drainage, DTU standards violated).

Amicable mediation initiated (registered letters, triple-party meetings), with no progress after 3 months. Launch of referral to the President of the Paris TJ: emergency summons of neighbors, appointment of judicial expert tasked with causes/responsibilities/works (forced access to private areas if refused). Accelerated procedure (first expert report within 6 months instead of the usual year), condemnation for restoration to standards + damages/interest.

Co-op informed, insurance dossier fed – claim resolved judicially, peacefully.