A rare opportunity to acquire an exceptional private mansion built in 1903, combining the architectural charm of the Belle Époque with the comfort of a fully-serviced building, offering a total floor area of 1,141 sqm and 849 sqm of living space. Set over three upper levels and a basement, this characterful property is centred around a grand staircase bathed in natural light through a remarkable overhead light well, a true architectural signature of the building. The ground floor (236 sqm) features an elegant entrance hall opening onto the inner courtyard and the common areas. The upper floors, totalling 765 sqm, will impress with the quality of their finishes: hardwood parquet flooring, moulded ceilings and generous volumes lend each level a timeless and refined atmosphere. At the rear of the building, a private courtyard offers a rare breath of open space, while the first floor benefits from a 30 sqm terrace, perfect for enjoying an outdoor area in the heart of the city. The basement (242 sqm) is fitted with a gymnasium complete with changing rooms and showers, complemented by storage spaces and a boiler room, providing remarkable amenities for either residential or professional use. The entire building is served by a lift.