Behind the centuries-old walls of the Hôtel du Châtelet, emblematic headquarters of the Chambre des Notaires de Paris since 1856, a major transformation has been completed after two years of painstaking work. Orchestrated by Atelier Senzu, this renovation not only restores a heritage site, it also breathes new life into a place steeped in history, while meeting the contemporary demands of a profession in the throes of change.