317 Old Mill Rd Smithtown, NY 11787

Welcome to "The Hill Valley House," where timeless design and modern luxury come together in perfect harmony. Completed in 2023 with no expense spared, this one-of-a-kind custom estate sits on 2.66 acres of lush, private grounds and offers an extraordinary blend of timeless design and cutting-edge innovation.

Step inside to experience an ambiance of sophistication and comfort, with soaring 10' ceilings throughout, high-end custom treatments, and impeccable finishes. The grand great room is anchored by a stunning dual-sided gas stone fireplace and flows seamlessly into the heart of the home—a spectacular, state-of-the-art gourmet kitchen. Designed for both beauty and function, this culinary showpiece features rich custom wood cabinetry, sleek quartzite countertops with a dramatic waterfall edge, and a large center island with ample seating—perfect for casual dining or elegant entertaining. The kitchen is fully outfitted with top-tier stainless steel appliances, including a professional-grade six-burner gas stove, wine fridge, and an inviting dinette area that overlooks the tranquil backyard.

The first-floor primary suite is a true sanctuary, boasting walls of glass that invite nature in and a spa-inspired ensuite with exquisite tilework, a soaking tub, walk-in shower, custom wood double vanity, and a spacious walk-in closet. A private first-floor office adds convenience and flexibility. Upstairs, three additional bedrooms each feature their own ensuite baths, including one with a private rooftop deck. A second-floor entertainment area with built in speakers and walk-in storage room or office complete the upper level.

One of the crown jewels of "The Hill Valley House" is the screened-in porch—a luxurious outdoor haven designed for year-round enjoyment. Featuring double French doors, a dramatic dual stone gas fireplace, built-in infrared heaters, and a refined dining area, this exceptional space merges indoor elegance with outdoor serenity.

The finished basement includes a dedicated home gym and a vast unfinished area with endless potential—ideal for a media room, wine cellar, or additional living space tailored to your lifestyle.

Adding to the home’s long list of luxuries are a state-of-the-art solar panel system, whole-house water purification, advanced backup power system, smart home technologies, as well as an oversized three-car garage.

Outside, your personal resort awaits—with a heated 19'x36' saltwater in-ground pool, cozy fire pit, and expansive patios—perfect for entertaining or peaceful relaxation.

The Hill Valley House offers a lifestyle that feels like a permanent vacation—set on lush, resort-like grounds, yet just minutes from Long Island Sound beaches, local marinas, restaurants, charming town shops, and Stony Brook University.

Truly, no detail was overlooked in the creation of this exceptional home. From its superior construction to its thoughtfully curated finishes, this is more than a home—it’s a lifestyle. Make this dream property yours today.