Apartment 5/6B presents a unique opportunity to own a rarely available duplex co-op in Gramercy's most coveted address, One Lexington Avenue. Built in 1910, this intimate pre-war building is timeless and elegant, and in the perfect location for full views of Gramercy Park. Apartment 5/6B, designed by renowned architect Annabelle Selldorf, combines the building's pre-war details with spectacular contemporary renovations, creating a loft-like classic home. Enter the apartment through a grand gallery - perfect for art - which leads into the huge living room flooded with sunlight from four oversized windows high over Gramercy Park. The formal dining room/library also has a wood-burning fireplace plus a charming bay window. The thoughtfully designed windowed eat-in kitchen will satisfy the most discerning chef, and the space accommodates both casual everyday living and large-scale entertaining. The kitchen has top of the line appliances, custom cabinetry, and Cipollino marble countertops and backsplash. An elegant powder room off the gallery completes the first floor. Ascend the gracious stairway to a spacious second floor landing, and enjoy more park views from each room of the large master suite. This area includes the master bedroom, walk-in closet, separate study/den (that could also function as a fourth bedroom), and an enormous marble master bath with a separate tub, shower stall and heated flooring. There are two additional bedrooms that share an oversized bathroom and separate laundry room, which could convert into a staff room or additional bathroom. The apartment has a Crestron sound system, wide plank white oak floors, multi-zone central air conditioning, new windows, and luxurious fixtures and finishes throughout. This pet friendly building has basement storage and a bike room. Pied-a-terres not permitted. Residents of One Lexington receive one of New York's most coveted amenities - a key to Gramercy Park.