Tucked behind the gates of McGregor Highlands, this mountain luxury estate commands an impressive 11.29 private acres and includes its own coveted deeded boat slip on the pristine waters of McGregor Lake. Positioned for complete seclusion and direct immersion in nature, the property offers a rare gateway to premier outdoor recreation, sitting just moments from expansive Montana State Trust Lands. Down at the water's edge, exclusive access to community features awaits, including a dynamic waterfront pavilion, a private dock system, and a convenient boat launch. The main residence expands across three floors of carefully planned mountain luxury. Soaring vaulted ceilings and a monumental stone floor-to-ceiling fireplace anchor the great room, where an unmatched wall of windows frames continuous views of the water and the timbered canopy beyond. The main floor flows into a high-end chef's kitchen-equipped with a professional six-burner range, customized cabinetry, and an expansive pantry-adjacent to a wide dining area that steps out directly to the deck. The main-level primary suite functions as a private sanctuary, complete with its own cozy stone fireplace, walk-out deck access, and an ensuite bath featuring a jetted soaking tub, walk-in shower, and a massive walk-in closet. A custom log stairway transitions past a quiet powder room up to an open loft library lined with extensive built-in shelving overlooking the living space below. Optimized for high-end hosting and recreation, the fully finished walk-out lower level features a spacious family room centered around a third stone fireplace and a massive wet bar finished with granite countertops, wine racks, and a custom sink. The entertainment space easily accommodates a full-sized pool table before leading into a soundproof, tiered home theater room. 2 guest bedrooms and a full tiled bathroom complete the basement footprint, opening directly onto a lower-level concrete patio and an outdoor fire pit area. A main-floor utility mudroom satisfies practical needs with a custom dog wash station and quick access to a heated three-car garage. Completely separated for premier guest privacy, a 900-square-foot secondary dwelling sits above the garage, showcasing a bright, open floor plan with built-in cabinetry, dual dormer spaces utilized as a home office and sitting area, and a luxury bathroom featuring a specialized steam, sauna, and jetted shower unit. Meticulously engineered for convenience and peace of mind, the property features an underground propane tank, a dedicated Wi-Fi boost system, a detached storage shed, and a whole-house backup generator system.