Located on a verdant tree-lined street on the Upper East Side, this very lovely four-story townhouse presents the ideal combination of elegant period detail and modern convenience. Built in 1899, the house has for many years been the residence and inspiration for one of Architectural Digest's AD100 designers, and is an exquisitely-conceived oasis for its occupants and also offers delightful possibilities for entertainment. An elevated stoop accesses the main entrance on the parlor level. With soaringly-high ceilings and rich architectural detail, this floor provides a magnificent entertaining space and particularly recalls the past in its rich detail. A welcoming Center Hall opens to an elegant Living Room with a wood-burning fireplace and pretty northern outlooks over lush gardens. A large private Library, also with a wood-burning fireplace, is an oasis, with upholstered walls and very tall windows with southern outlooks. A coat closet is conveniently accessible. Below, the garden level features a very large and bright eat-in kitchen with top-of-the-line appliances and unique, custom-designed cabinetry. The kitchen conveniently has an entrance from the street level. Beyond, the very welcoming Dining Room overlooks a lush bamboo garden that is accessed by four glass-paneled doors. The seamless transition from indoors to outdoors is truly magical. A stylish Powder Room and ample closets are nearby. Downstairs, the finished Basement level includes a Laundry Room, abundant storage, and a extremely spacious wardrobe room with a coded security system. The private quarters extend across the third and fourth levels. The third floor is a generous Primary Suite that includes two large and exquisitely-designed Bedrooms, one of which features a wood-burning fireplace and peaceful vistas over the neighborhood gardens. A second Bedroom with southern outlooks is equipped with a drop-down state-of-the-art film projector and motorized hidden screen. The Bedrooms are supported by very ample closets and a shared Bath. Above, the uppermost floor has two additional large Bedrooms, one with beautiful treetop outlooks, and the other is flooded with southern light and has yet another wood-burning fireplace. Both Bedrooms have abundant closets and share a serene and spa-like white Bathroom with a very large shower and a skylight. Throughout the house, hardwood floors, custom millwork, and very high ceilings underpin an elegance that extends to every detail and has been executed with great care. The residence is equipped with central air conditioning (multiple-zones) and Sonos and security systems. Current zoning allows for the possible addition of a fifth floor, the development of a roof garden, or a building extension (1,000 sq. ft.).