Set on approximately 1.39 acres in one of Sudbury's most coveted cul-de-sac neighborhoods, this magnificent 5,811-square-foot Colonial offers exceptional privacy, sophisticated living, and an extraordinary sense of space in a premier school district. The impressive residence features 4 bedrooms, 4 full baths, 1 half bath, three fireplaces, and a three-car garage. A gracious foyer opens to a handsome mahogany-paneled private office, followed by an elegant living room with fireplace, formal dining room, and an oversized open-concept kitchen designed for both everyday living and grand entertaining. The spectacular family room showcases soaring cathedral ceilings and a dramatic stone fireplace, while a beautiful three-season sunroom, finished with a richly paneled wood ceiling, overlooks the expansive grounds and creates a serene setting for year-round enjoyment. The second floor offers a magnificent primary suite with a private sitting room, luxurious bath, sauna, and an abundance of custom closet space, creating a truly private retreat. Three additional generously proportioned bedrooms provide exceptional flexibility, including one bedroom with its own en-suite bath and two bedrooms connected by a Jack-and-Jill bath. The finished 1,744-square-foot walk-out lower level further expands the living space with a media area, fireplace, playroom, exercise room, and private guest or au pair suite with full bath. Beautifully landscaped grounds feature stone walls, mature gardens, and expansive outdoor space reminiscent of a private country estate. Ideally positioned within walking distance of schools, tennis and pickleball courts, ballfields, the rail trail, and a nearby park, this remarkable property offers an unparalleled combination of elegance, privacy, convenience, and gracious living in one of Sudbury's most desirable settings.