123 9th Avenue Magnificent Colonial offers a unique and flexible layout perfect for a variety of living arrangements. Set on one of the largest lots in the neighborhood, this .57-acre lot in the desirable Sachem School District is fully fenced offering a ton of privacy as it's backed up against county land. Located minutes from Sunrise highway, LIE, LIRR & The waterfront village of Patchogue. This home truly has it all. The layout offers flexible living space ideal for extended family or guests! A sun-filled foyer with a second-floor balcony overlook creates bright and open first impression. The home features four large bedrooms, three full bathrooms, and one half bath, providing plenty of room for even a home office. The expansive primary suite offers abundant closet space and a large bathroom. The kitchen is equipped with newer appliances, and the home has been enhanced with updated windows throughout and a new glass slider, bringing in natural light and energy efficiency. Comfort is maintained year-round with new one-zone central air and multi-zone electric heating powered mostly by Solar. Additional upgrades include a 200-amp electrical service with a 100-amp subpanel and an electric hot water heater. Outside, the property truly shines. Enjoy a brand-new TimberTech multi-level deck with built-in lighting, perfect for entertaining or relaxing evenings. The yard also features new multi-level paver patios, retaining walls, and mature landscaping, creating a private, park-like setting. Additional highlights include: 9-zone in-ground sprinklers, Hook-up for a whole-house generator, Large storage sheds with electric, Newer roof, leaded Solar panels, Two-car garage with attic storage and so much more! With its combination of space, updates, and outdoor living, this home offers a rare opportunity in a convenient Holtsville location close to shopping, major roads, and local amenities. A must-see property with room to grow and the flexibility today's buyers are looking for.