A truly one-of-a-kind townhouse WITH ATTACHED CARRIAGE HOUSE and gorgeous courtyard. Graced with an eclectic collection of premiere finishes and amenities, this 5-bedroom, 6.5-bathroom home is a paragon of urban luxury and design. Features of this 6,047 sq. ft. residence include an elegant limestone façade, gorgeous hardwood floors, a blend of floor-to-ceiling and casement windows on every floor, a convenient laundry room, elevator access on every level, a pair of manicured outdoor spaces, integrated smart home technology, a back-up generator, and an incredibly restored 1,220 sq. ft. coach house complete with its own kitchen, bathrooms, living space, and a clandestine underground entrance. Beyond a formal entryway, the garden floor of the home flows into a luminous kitchen and dining area. The dining space is serviced by a wet bar and a powder room, and has easy access to a limestone courtyard fully equipped with a gas grill, a refrigerator, a sink, lighting, and speakers. The Poliform kitchen boasts an eat-in peninsula, sleek countertops, and a suite of high-end stainless steel appliances. The second floor contains a floor-through living and entertaining space as well as an impressive gas fireplace augmented with a remarkable stone surround and a chic light well. The third floor is split between a family room, a powder room, and a spacious bedroom with a private closet and full en-suite bathroom. A pair of bedrooms with charming built-ins and pristine en-suite bathrooms occupy the fourth floor, while the fifth floor is dedicated entirely to a tranquil master suite that possesses an entire wall of custom closets and a windowed en-suite with dual vanity sinks, a massive walk-in shower, and a free-standing soaking tub. The rooftop deck has integrated Sonos speakers and commanding views of the surrounding neighborhood. The cellar contains a laundry room, a 150-bottle wine room, custom closets, and a passageway that leads to a two-story coach house. The lower level of the coach house features an open-concept Poliform kitchen and dining area that opens into the courtyard, a powder room, and a sky-lit double-height living room with custom closets and a wood-burning fireplace. The upper level contains a huge bedroom with an immense en-suite bathroom. Situated in the heart of the Upper East Side, 251 East 61st is just steps away from a number of restaurants, shops, cafes, and bars. It is just two blocks from Bloomingdales and is a short walk to Central Park. Nearby subway lines include the 4/5/6/N/Q/R/W/F. 10,000 sq. ft. of air rights are included.