Treehouse-like architectural home with extraordinary outdoor amenities and abundant gardens. Remarkable property! A one-of-a-kind 1977 hexagonal home on more than half an acre in the El Sobrante hills, with post-and-beam construction, a central cupola, clerestory windows, broad expanses of Pella glass, and sweeping south- and west-facing valley views. Approx. 2,200 sq. ft., this 3BR/3BA home offers flexible living on two levels, including two upstairs bedrooms and the main living spaces, plus a lower-level retreat with hardwood floors, electric fireplace, 2 walk-in closets, modern ensuite bath, and private deck. Both ensuite bedrooms, one on each floor, include electric fireplaces; the upper-level ensuite is currently staged as an entertainment room. Outside, discover a stream with two pedestrian bridges, a koi pond, lemon, apple, tangerine, peach, nectarine, and pomegranate trees, berries, 20+ raised beds, and ~1,000+ sq. ft. of enclosed growing space, plus a combined putting & bocce ball court, a pickleball net for casual play, a hot tub tucked among redwoods, a wood-burning firepit, and a fully equipped outdoor kitchen. $300,000+ in upgrades include owned solar, mini-split heat/AC on each floor, updated decks, new cupola windows, and renovated baths. Oversized 2-car garage with workbench, built-in wine racks, second refrigerator, and cool storage. Square footage per appraisal; buyer to verify.