Enter into this full-floor, four-bedroom condominium through your private key lock elevator access. A private landing leads you to an expansive home graced with open North and South city views and a private terrace in the sky. This home is 3,212 square feet of intelligently designed luxury in the boutique, LEED certified Harsen House. This 4-bedroom, 4-bath home is in turn-key condition and artfully combines the warm feel and space of townhouse living with the openness of a loft.   A thoughtful layout separates the bedrooms into distinct North and South wings, offering exceptional privacy and flexibility guests or home office use. The expansive entertaining spaces flow from a gracious living room-featuring high ceilings, a gas fireplace and custom book shelving to a sun-filled South facing family room with its own additional fireplace and a 22-foot landscaped terrace, offering a serene escape with open Upper West Side views.   The luxurious primary suite is a retreat of its own, complete with two walk-in closets, and a spa like five-piece bath. A bedroom and separate laundry room complete the Noth wing of this home. Additional bedrooms are perfectly located in the South wing, allowing for privacy and space.   Additional highlights include: Two fireplaces Custom-built laundry and storage rooms In-wall surround sound and Lutron lighting throughout Smart home automation Acoustically isolated floor-to-ceiling windows Hardwood floors High ceilings and bespoke finishes throughout   Residents of the Harsen House enjoy top-tier service, including a 24-hour doorman, a state-of-the-art fitness center, an oversized children's playroom, and private storage. Located just off Central Park and moments from the best of the Upper West Side, this is a rare opportunity to own a designer-upgraded, full-floor sanctuary in one of the neighborhood's most sought-after green buildings.