Rare and remarkable 100-acre legacy property in the foothills of Golden, CO-offering privacy, sustainability, and breathtaking views. This one-of-a-kind, earth-sheltered home is built into the mountainside with thick concrete walls, passive solar design, and a living grass roof that blends seamlessly into the natural landscape. Enjoy unobstructed mountain, valley, and city views, along with direct access to Jefferson County Open Space and miles of hiking and biking trails. Set at the end of a one-mile privately maintained road, the 3BD/2BA home features vaulted ceilings, open-concept living, Saltillo tile floors that retain solar warmth, Brazilian engineered hardwood, and clerestory windows that fill the space with light and air. A cast-iron woodstove and thermal mass wall warm the living areas and adjacent primary suite, while electric ceiling panels provide supplemental heat. The kitchen offers custom wood cabinetry, center island, and panoramic views, with direct access to a spacious composite deck-perfect for sunset dining or relaxing in nature. The primary suite includes wall-to-wall windows, a cozy sitting nook, walk-in closet, and deck access. Two additional bedrooms feature outdoor access, generous storage, and a shared Jack-and-Jill bath. A 3-car attached garage is complemented by a second detached 3-car garage. This site features a permitted, income-producing 150-foot guyed communication tower and a 645-square-foot control building, all located on a separate 5.6-acre parcel zoned for special use by Jefferson County (~$16K/year gross revenue). Surrounded by protected land, wildlife, and expansive skies, this sustainable retreat offers peace, purpose, and a deep connection to the landscape-just 30 minutes from Golden.