Upper Marais – Meslay / Notre-Dame-de-Nazareth Hidden away in a peaceful historic courtyard, this remarkable 1,572 sq. ft. residence (1,475 sq. ft. under the French Carrez law) is a rare architectural gem in the heart of historic Paris. Combining beautifully preserved stone-vaulted interiors with striking contemporary design, the property offers a truly unique living experience. The home is centered around a spectacular glass-roofed patio that seamlessly connects a spacious main residence on the ground floor with a self-contained guest apartment arranged over two levels. Two dramatic skylights flood the interiors with natural light, enhancing the property's generous volumes and open-plan layout. Designed for both comfort and functionality, the residence features extensive custom storage, two independent entrances, and exceptional flexibility of use. A 280 sq. ft. basement, directly accessible from the apartment, provides valuable additional space for storage, a laundry room, a wine cellar, a fitness area, or other recreational uses. Total usable area: 1,851 sq. ft. The property also allows mixed residential and professional use (non-client-facing activities only), making it equally suited as a primary residence, a pied-à-terre, or a discreet live/work space. A rare opportunity for discerning buyers seeking distinctive architecture, exceptional tranquility, and an authentic Parisian setting in one of the city's most desirable neighborhoods.