Penthouse 1 is a stunning full-floor residence located in the heart of the Flatiron District, one of New York City's most coveted and vibrant neighborhoods. This exceptional 4,841 sq. ft. four-bedroom, four-and-a-half bath home is accessed directly via a keyed elevator, offering privacy and exclusivity. The expansive layout boasts grand entertaining areas and generously sized bedrooms, all bathed in natural light from the south-facing windows and floor-to-ceiling accordion glass folding doors. Two private terraces, totaling 541 sq. ft., further enhance the living experience, providing ample outdoor space. Upon entering, a spacious foyer opens into a spectacular living and dining room that features two distinct seating areas. One area is highlighted by custom millwork and a dramatic bio-fuel fireplace, while the other opens directly onto the living room terrace complete with a BBQ unit, perfect for al fresco dining. Both the living room and the primary bedroom suite seamlessly transition to inviting outdoor spaces, creating a harmonious blend of indoor and outdoor living. The open-concept kitchen is designed for both functionality and elegance. It is equipped with premium appliances and fixtures from Miele, Julien, and Grohe. The kitchen features sophisticated white oak cabinetry, a stainless steel countertop and backsplash, and a custom 10.5 ft. long marble island. A concealed butler's pantry discreetly complements the kitchen with additional storage, refrigeration, and preparation space. Adjacent to the kitchen, the entertainment/media room can be opened or closed off via sliding doors, offering flexibility for both accessible and private settings. This home is designed for both privacy and spaciousness with two distinct wings of sleeping quarters. The primary suite occupies the west wing of the residence, providing spacious sleeping and sitting areas, expansive dual custom wardrobes, and a unique midnight kitchenette. The five-fixture primary bath is a sanctuary of relaxation, featuring a freestanding matte white LaCava bathtub, a walk-in shower, and radiant floor heating, creating a luxurious spa-like retreat. The three additional bedroom suites each have their own ensuite baths and walk-in closets, ensuring comfort and privacy. Tech enthusiasts will appreciate the Savant Home Automation platform, which allows seamless control of lighting, climate, music, and more, all from a smartphone. Other upgrades include electronic sheers and blackout shades, a state-of-the-art lighting system, and a Sonos sound system throughout the residence. 21W20 is an exclusive collection of homes designed by renowned interior architect David Mann of MR Architecture + Decor. Building amenities include a 24-hour doorman, a private lobby lounge with a kitchenette, a spacious outdoor garden with relaxation and seating areas, and refrigerated storage for grocery deliveries. The building also offers secure elevator-accessed bicycle storage, a large-capacity washer and dryer, and a pet wash room. Additionally, there are two separate walk-in storage units that transfer with residence PH1. This extraordinary residence offers an unparalleled living experience, combining refined design, cutting-edge technology, and desirable amenities in one of the most dynamic neighborhoods in the city.