Discover the pinnacle of indoor-outdoor luxury living in the heart of New York City with this exceptional four-bedroom, four-and-a-half-bathroom duplex home. Over 4,700 square feet of living space combined, including 3,078 square feet indoors and an impressive 1,710 square feet of private roof terrace, this residence redefines urban elegance. The sprawling sun-drenched private terrace offers an unrivaled space for relaxation or hosting unforgettable gatherings. Every room is bathed in natural light, thanks to the floor-to-ceiling windows, exuding modern sophistication, all meticulously curated by the renowned Architectural Digest Top 100 architect, S. Russell Groves. Upon entering, an inviting foyer and extended gallery set the stage for an expansive entertainment space that seamlessly connects to the outdoor areas. The spacious open-concept Poliform-designed kitchen is a chef's dream, featuring premium Italian Calacatta marble, top-of-the-line Miele appliances, and a separate wine fridge. A dedicated dining area and an expansive living space complete the great room, providing for effortless indoor-outdoor flow. The lower level of the residence is designed for entertaining and also houses the apartment's large fourth bedroom, which can flexibly serve as a home office or media room, and is complete with an en-suite bathroom. A custom staircase and banister connect the upper level, serving as both a striking focal point and a conversation piece in the great room. The primary bedroom suite on the upper floor enjoys a sun-soaked south and west corner exposure, boasting two walk-in closets and an impressive windowed marble bath with a glass-enclosed shower and a deep soaking tub that overlooks the terrace. The upper floor is further complemented by two additional guest bedrooms and bathrooms, a versatile den space perfect for a media room or a flexible play area for children, and a dedicated laundry room, providing secondary access to the apartment on the 9th floor. Designed by the renowned architect S. Russell Groves, the Halcyon Condominium offers a wealth of luxurious amenities, including a state-of-the-art spa-inspired space with a light-filled movement studio on the 21st to 22nd floors, a 52-foot heated pool and an indoor sundeck on the 22nd floor, a fitness studio, sauna, steam room, children's playroom, library, terrace, and sky lounge. The building's prime location is just steps away from the 51st Street 6-line Subway station, the 53rd Street E/M-lines station, Grand Central Station, and Midtown. Nestled on a vibrant block, the building is surrounded by some of New York's finest dining, shopping, and cultural institutions. Secure your private showing today! This apartment sale includes a private storage unit.