RARE. Facing Ile Saint-Louis, in one of the most beautiful private mansions of the Marais — the Hôtel Nicolaï, built in the 17th century and recently the subject of a remarkable restoration — this stunning duplex apartment of 170.88 sqm (145.3 sqm under the Carrez Law) is located on the noble floor, accessible by elevator, and has been elegantly redesigned by architect Fabrizio Casiraghi. A place full of charm, with rare volumes (4.5 m ceiling height), bathed in light (Southwest - East exposure), offering unobstructed and pleasant views over the Seine, and complemented by a beautifully landscaped 25.58 sqm terrace on the same level. The property is laid out as follows: - On the main level, the entrance leads to a vast reception room with grand proportions, featuring a corner living room that opens onto the terrace designed by landscape architect Louis Benech, a dining area, and a fully fitted and equipped open kitchen (La Cornue). This level also includes a bathroom with toilet and a mezzanine office (or guest bedroom). - On the lower level, a beautiful master suite with a spacious bathroom including bathtub, shower, and separate toilet, along with a custom-made walk-in closet. An exceptional apartment offering high-end features: refined renovation, premium materials, air conditioning, and two independent entrances. A cellar completes this outstanding property. Resident caretaker.