A study in meticulous architecture and the highest craftsmanship, this triple-mint 4,100+ sq.ft. duplex sits on a highly-coveted, tree-lined Upper East Side block, between Park and Madison. A grand, elegant residence, this four bedroom, (with a fifth staff bedroom), six and a half bathroom triumph of design awaits the most discerning, sophisticated and refined buyer. Entering this exceptional home through the handsome vestibule, you are greeted by a grand foyer with six coat closets and soaring ceiling heights of almost 19. Under high-gloss painted ceilings, the grand room is designed for living and dining, seating 20 people, and crowned by a wood-burning fireplace with a custom limestone mantle. A zinc-mirrored bar is topped with Polaris marble and provides ample storage options, supplemented by an adjacent walk-in china closet. Decorated with faux horsehair wall covering, a huge entertaining room is split between a media room with custom-built cerused grey oak cabinets and a double workspace with a wall of six floor-to-ceiling closets. Bright and airy, the windowed chefs stainless-steel clad kitchen boasts a suite of top-of-the-line appliances from Wolf, SubZero and Miele, 2 thick Carrara marble countertops and sits adjacent to a spacious breakfast room with custom banquette seating for eight. A full-size laundry room with full-size, vented Whirlpool W/D leads to a staff bedroom with a full ensuite bathroom, and a separate staff entrance. A chic, discreet powder room with a Polaris marble sink and hand-painted pearlescent venetian plaster round out the components of the entertaining space. A study in large scale minimalism, the wood and bronze split-level staircase takes you up to the private quarters. An ideal meeting place, the open seating area serves as the hub for the four bedrooms. The palatial primary suite boasts a wood-burning limestone-mantled fireplace, huge windows and generous supplemental closets. A long gallery toward the ensuite bathroom opens dramatically over the foyer downstairs, maximizing airflow and natural light. The enormous dressing room/walk-in closet surrounds the stunning bathroom, which features blue de savoie marble tiling, a double-head shower with overhead rain faucet, jets and hand showers, with Dornbracht fixtures, two separate WCs and plentiful storage. Three bedrooms are all flooded with natural light, and feature custom-built extra-long workstations, as well as bright, milk-glass clad ensuite bathrooms with heated floors, scratch- and stain-proof Corian sinks and counters, Waterworks hexagon tiling and Waterworks chrome fixtures. Carefully considered design touches include sound-attenuated oak flooring, custom convector covers that double as storage, LED-lit closets, as well as electric shades, six-zone AC with four supplemental units. All new LED lighting, electric, plumbing, windows, HVAC and AV systems ensure comfort and convenience. A 100 sq. ft, storage unit is deeded to the apartment as well. Steps from Central Park, 70 East 77th Street is a prewar cooperative ideally located on a beautiful, iconic Upper East Side block between Madison and Park Avenue. Impeccably maintained, the building offers a 24-hour doorman and live-in resident manager, as well as a newly renovated fitness center, a large outdoor lounge and play area, extra storage opportunities and a bicycle room. Surrounded by iconic hotels and restaurants like the Carlyle Hotel and The Mark, as well as world-class shopping on Madison Avenue, and the best museums in the world, this incredible home awaits only the most discerning buyer. There is a 3% flip tax.