Twin Terrace Duplex Penthouse Just off Central Park.  Welcome to this full-floor duplex penthouse with twin terraces and high-end finishes throughout, a huge 3-bedroom, 2.5-bathroom Hell's Kitchen condo located just over a block from Columbus Circle and Central Park.   Floor-to-ceiling windows and rich cherry hardwood floors receive radiant sunrise and sunset light. A lovely fireplace and exposed redbrick walls are charming pre-war details that hearken back to the city's past, while pre-wiring for cable, telephone, and high-speed internet cater to its present and future. Recessed and pendant lighting punctuate ceilings that are nearly 10 ft. in height. The two west-facing terraces combine for 900 sq. ft. of private outdoor space and offer ample opportunity for alfresco dining, entertaining, sun lounging, gardening, and more.   A key-locked elevator opens into a windowed entry gallery flanked by formal living and dining rooms with attached terraces. The living room has a fireplace and a convenient powder room, while the dining room flows into an open-concept kitchen and family room. The kitchen is adorned with an eat-in peninsula, sleek stone countertops, custom walnut and stainless steel cabinets, a ceiling-mounted oven hood, and fully integrated high-end appliances from Viking, Sub-Zero, and Bosch.    Beautiful floating stairs lead up to the upper level of the home. The primary suite occupies an entire wing and boasts incredible city views, dual reach-in closets, a quiet sitting room, and a windowed en-suite bathroom with a custom walnut double vanity, wall-mounted chrome Watermark fixtures, mosaic marble and marble slab tilework, a glass-enclosed walk-in shower, and a whirlpool tub from Kohler. The second and third bedrooms sit on the opposite side of the upper level. Each one has a large reach-in closet and easy access to an elegant second bathroom with mosaic tile walls and floors, a custom walnut vanity, chrome Watermark fixtures, and deep tub. A stacked washer/dryer completes this stunning home.   Originally built in 1910, 426 West 58th Street is a full-service boutique condominium with a 24-hour door attendant, a private fitness center, private storage, a bicycle room, and a tranquil courtyard. The building is close to a wide variety of restaurants, bars, cafes, and shops, and it is close to Time Warner Center, Lincoln Center for Performing Arts, Columbus Circle, Central Park, and Carnegie Hall. Accessible subway lines include the 1/A/C/B/D.