9 (TIE). Rancho San Carlos in California has been owned by the same family for over 100 years, and it's easy to see why. Sitting on 237 acres, the 30-room main residence spans almost 30,000 square feet on two natural terraces.
Price: $85 million
Additional perks include 10 guest cottages, extensive equestrian facilities, and sprawling orchards.
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