This spectacular 1864 carriage house in the Estate area of Riverdale is one-of-a kind! Sprawling and Sunny on a half-acre lot with 4 bedrooms and 3.5 bathrooms spread over 3,664 square feet plus additional 1,523 square foot lower level (Garage and Home Gym), totaling 5,187 square feet.Featuring high ceilings and generous open space, the Great Room is the centerpiece of the main level with a wood burning fireplace and soaring 19.5' ceilings, leading to an outdoor patio overlooking beautifully maintained gardens. The Den is serene and over 25' in length while the formal Dining Room also leads to outdoor patio and garden.Windowed eat-in kitchen with large center island and granite counter-tops with commercial grade Garland 6 burner stove, sub-zero refrigerator and two dishwashers.The master bedroom suite features a walk-in closet with expanded and newly renovated en-suite bath with double sinks and large soaking tub. The additional two bathrooms have been fully renovated and bask in sunshine provided by skylights. Newly sanded and refinished hardwood floors in impeccable condition throughout. Sonos entertainment system wired for indoor and outdoor use, 4 zone central air conditioning, lawn sprinkler system, security system, three car garage (one converted to home gym) and 8 car private driveway.Summers may be spent at the private association swimming pool. Partial views of the Hudson River and Palisades and minutes to the Metro North Station and Wave Hill Public Gardens.