This remarkable 4-bedroom, 4.5-bath duplex, with an expansive 1,710 SF private terrace, seamlessly blends indoor sophistication and outdoor luxury. The First Floor corner great room, with sweeping south and west exposures, is bathed in natural light through floor-to-ceiling windows. The chefs kitchen is outfitted with Miele appliances, a marble waterfall island, and sleek Poliform cabinetry. Direct terrace access from the kitchen, complete with a built-in grill, makes al fresco dining effortless. This level also includes a bedroom with an en-suite bath and a powder room off the elegant entry hall. Upstairs, the corner primary suite features two walk-in closets and a spa-like bathroom. A flexible den or media room connects to two additional bedrooms and a full laundry room. Elevator access to the upper floor provides convenient secondary entrance. Completed in 2013, The Halcyondesigned by S. Russell Grovesoffers a full suite of spa-style amenities, including a 50-foot pool, sauna with East River views, steam room, state-of-the-art gym, yoga studio, and a two-story Sky Lounge. Additional perks include a golf simulator, childrens playroom, and full towel service. Perfectly positioned for easy commuting, with the 6 train at 51st & Lex, the E and M at 53rd, and Grand Central just minutes away. Surrounded by premier shopping, dining, and cultural landmarks, this home makes Midtown living effortless.