1582 Route 9W Perched high above the Hudson River on 3.9 private acres in Marlboro, NY, this one-of-a-kind custom-designed single-level estate delivers panoramic river views, breathtaking east-facing sunrises, and an unmatched lifestyle of modern luxury in the heart of the Hudson Valley. Whether you're searching for a luxury Hudson Valley retreat, a private entertainer's estate, or a designer Hudson River home, this property checks every box. Step through a custom entry foyer into a sun-drenched chef's kitchen outfitted with quartz countertops, bespoke cabinetry, an oversized island with seating, pot filler, professional gas range, and wine refrigerator, everything a culinary enthusiast could desire. The open-concept living and dining areas flow seamlessly behind floor-to-ceiling accordion glass doors that disappear entirely, merging the interior with spectacular river views and creating an effortless indoor-outdoor living experience. The resort-style backyard is truly extraordinary, a full inground pool with water features and slide, hot tub, sauna, stacked-stone outdoor bar with changing room and bath, fireplace, multiple terraces, a Juliet spiral staircase with balcony, and a covered porch. The grounds also feature a secret garden retreat with a private fireplace and starlit patio, a vineyard with grapevines and fruit trees, a playground, detached barn, and beautifully hand-crafted stone walls, all set within a privately gated, professionally landscaped property. Inside, the luxurious primary suite offers private exterior access, a spa-inspired bath with double vanity and rainfall shower, and a generous walk-in closet. A second bedroom shares a full bath with tub and shower. Additional features include a two-car garage, a walk-up partially finished attic ideal for a home office or den, a built-in sound system, energy-efficient doors, and abundant parking. Located minutes from award-winning Hudson Valley wineries, farm markets, and the scenic Hudson River waterfront.