A prestigious building from the 1930s in the heart of Paris’ business district has been carefully redeveloped. On the façade overlooking Rue de Jeûneurs, on the building’s six floors, no fewer than 40 windows were replaced, as well as another six on the sixth floor corridor of one of the building’s two internal courtyards. The FerroFinestra W40 system has faithfully respected the prospect of the 1930s façade, and allowed the building – which is part of the inventaire historique of Parisian buildings – to offer adequate living comfort and improved thermo-acoustic performance.