This exceptional custom-built luxury residence set on over an acre of private land is just minutes from downtown Newmarket. Finished in all-natural Quebec sandstone, this architectural home features a private triple driveway and rare four-car tandem garage with custom built-in storage.The grand foyer showcases marble and metal inlay flooring with soaring arched cathedral ceilings. Wide-plank white oak floors, bespoke millwork, and designer lighting flow throughout. The main level offers a heated mudroom with five custom coat closets and a private guest suite with walk-in closet and 4-piece ensuite.The chef's kitchen is designed for entertaining, featuring dual islands, quartz countertops, custom cabinetry with frosted glass accents, pantry and servery, and premium Thermador appliances including a six-burner range, dual wall ovens, and integrated fridge and freezer. Walk out to a covered loggia with ceiling fans and outdoor TV for year-round enjoyment. Upstairs includes a full laundry room and four spacious bedrooms, each with a walk-in closet and private ensuite. The primary retreat offers a private deck, custom walk-in closet, and spa-inspired ensuite with heated floors, steam dual rain shower, and soaker tub. The walk-out lower level features radiant heated floors, floor-to-ceiling windows, sauna, glass-enclosed gym, second kitchen and dining area, and access to a covered patio. Smart home features include Sonos speakers, motion lighting, central vacuum, dual-zone HVAC, hot water on demand, and steam humidifier.