Spanning a full floor and stretching to 5,721 sq. ft. (532 sq. m.) with 3,666 sq. ft. (340 sq. m.) of private outdoor space, Penthouse 20 is a magnificent residence meticulously designed by Steven Harris Architects. Offering four bedrooms and a library, four ensuite bathrooms, and a powder room, this gracious home features lofty 11'0" ceilings and 100' of continuous south-facing entertaining spaces with adjacent terrace, and a private roof terrace with outdoor kitchen and fireplace. Elegant architectural details and materials throughout include expansive casement style windows in a white bronze finish, 4" wide rift and quarter sawn American white oak flooring set in a chevron pattern in all living areas, recessed panel stile and rail doors with burnished nickel Nanz hardware, and custom plaster cornices in all primary rooms, hallways, vestibules, primary bathrooms, and powder rooms.

Through a private and keyed entry vestibule finished with St. Clair marble flooring and wire brushed rift cut European white oak wall paneling with integrated closets, residents are greeted by a steel and tempered art glass entry door leading into a light-filled entrance gallery with a soaring 24' ceiling. Ascend to the private roof terrace via the elevator or grand staircase custom designed by Steven Harris Architects. The roof is outfitted with a dining area, outdoor kitchen with grill, multiple lounge areas, fireplace, and all are connected via a magnificent Crepe Myrtle tree all e.

Located off the formal entrance gallery the entertaining wing including a gracious living room with a gas fireplace, a grand 27'10" x 18'1" formal dining room, a windowed eat-in kitchen, and corner breakfast room, each with terrace access, and featuring light-filled southern exposures and views of Gilded Age architecture along East 79th Street and Park Avenue, and of the midtown Manhattan skyline beyond.

The kitchen is outfitted in hand-painted custom Italian cabinetry with polished nickel trim, honed Imperial Danby marble slab countertops and backsplashes, and a custom stainless steel island with a Nordic Gray marble slab countertop. Professional-grade appliances include a 60" Wolf 6-burner range, wall oven, speed oven, and fully-vented range hood; two Sub-Zero refrigerators with integrated freezer drawers and a full-height wine refrigerator; two Miele dishwashers; and Julien stainless steel undermount sinks with InSinkErator disposals and Dornbracht faucets. A separate pantry offers an additional dishwasher by Miele and an additional sink. An adjacent laundry room with a sink is outfitted with a high capacity LG washer and dryer that vents to the exterior.

The bedroom wing offers tranquil and picturesque north and east views over gardens and landmarked townhouses below. The primary bedroom suite features three oversized walk-in closets, a windowed dressing room, a morning kitchen, and an east-facing wall of casement-style windows. The windowed primary bathroom is outfitted with honed Olympic Danby stone slab full-height walls and floors; a custom acid etched mirror vanity with an Olympic Danby stone slab countertop, nickel trim, and Lucite drawer pulls; recessed chrome-trimmed medicine cabinets featuring integrated lighting; and a Da Vinci freestanding soaking tub. Additional features include a separate nickel framed stall shower in fluted glass and a Duravit water closet.

Secondary bedrooms are generously proportioned and feature ensuite bathrooms clad in Honed Nestos Grey stone full-height tile walls and floors, a custom floating millwork vanity with a Nestos Grey slab countertop, and either a stall shower enclosed with frameless ribbed glass or a Kaldewei Puro undermount tub with a Nestos Grey slab tub deck and apron. Dornbracht chrome fixtures and a Duravit water closet complete these refined spaces.

The powder room, located adjacent to the entry gallery, provides a striking focal point with a floating vanity with a honed Maya quartzite slab countertop, custom integral sink, and matching door surrounds and base details along with Dornbracht fittings in a platinum finish and a Duravit water closet.

Additional thoughtful residence features include pre-wiring for home automation, pre-wired shade pockets in every room, VRF individually zoned heating and cooling, and a discreet service entrance.

109 East 79 offers an exceptional amenity suite, designed by Steven Harris Architects, and featuring sumptuous finishes throughout. A double-height lobby, clad in travertine and Belgian Blue marble, offering a 24-hour concierge, full-time doorman, and 24-hour porter leads to a grand lobby lounge and separate leather-paneled library all overlooking a landscaped garden with a sculptural water feature by the artist Mig Perkins. Upstairs, athletic and wellness areas include a light-filled fitness center by The Wright Fit overlooking the garden below; an international squash court / sports court with a retractable basketball net and backboard; a movement studio with Pilates and Gyrotonic equipment; and a spa with treatment room, infrared sauna, seam room, and hair salon. Leisure spaces include a 15-seat screening room, a game room, and a golf-simulator. Additional conveniences include bicycle storage, private storage for purchase, a dog grooming station, a dedicated service entrance, and a live-in resident manager.