Yorkville, Calif. Sedimentary walls add interest to this house of rammed earth, an insulating, low-impact material. The three-bedroom smart home, contoured to the land and its rock outcroppings, features concrete floors; glass walls framing native grasses, flowers, and oaks; a chef’s kitchen; and an entry with reflecting pool and floating steps. The 161.5-acre property includes a solar-heated saltwater pool; tiered landscaping; cabin, yurt, and barn with guest suite; and roads, trails, wells, springs, and an independent sustainable power system. $4,100,000. Kevin McDonald, Sotheby’s International Realty–Wine Country–Sonoma Brokerage, (707) 391-3382
Westport, Conn. This contemporary six-bedroom home comes with geothermal heating and cooling, triple-paned windows, tankless water heaters, and solar power. The house includes a vaulted skylit living area comprising family room and sunroom with adjoining chef’s kitchen; a two-story library…