Amazing, private, eco-friendly hilltop estate in highly desirable Southwest Austin location. This one-of-a-kind sustainable property combines rustic elegance & natural building materials with a resort-like feel that seamlessly blends into the gorgeous hill country landscape - all just 15 miles from downtown ATX! 5 bedroom, 5 bath home was designed by Gayle Borst of Stewardship Inc. & built by Cox Construction. The walls of the sprawling main house are constructed from compressed earth blocks designed to keep the house cool in the summer & warm in the winter. Gorgeous interior finishes include pecan wood floors, custom light fixtures, clay plaster walls, wood ceilings, clerestory windows, cork floors & beautiful countertops & tiles made from recycled materials. Secluded primary bedroom is expansive w/ French doors that lead to a private patio as do all bedrooms. Primary bathroom has soaking tub & walk-in shower. Living room takes full advantage of the abundant natural light & breathtaking landscape w/ floor-to-ceiling glass doors. Island kitchen is open to family room w/ wine fridge & windows that open to outside serving bar. 2nd story of main house has a private entrance to quarters w/ a large bedroom w/ en-suite bath & living room w/ built-ins perfect for home office & easy conversion to a full guest house. 2-car attached garage w/ epoxy floors, 3-car carport w/Tesla charger & adjacent office space/bonus room & concrete wall enclosed safe room - both w/ private entrances. Guest house has energy-efficient straw bale walls & is connected to main house by a covered walkway w/ amazing sunset views from its covered back patio! Split-level pool & spa with solar heating. Austin Energy Green Building 5-Star Rated. Low tax rate, fewer restrictions & great public schools! Garden with fruit trees & raised beds. Solar panels, 50K gallon rainwater collection cisterns, sprinkler system, solar water heater, invisible perimeter fence - see attachments for full list of features.