I don't know what the acreage size requared is for a building lot in this area of large homes. I always wonder if these folks have help in the cleaning and maintenance of such a huge responsibility.
I toured some mogul's early 1900s mansion with my wife a few years back. She commented "I'd sure hate to have to clean this place." My comment was "If we could afford this place, we could afford someone to clean it foe us." I like your wide view that includes several homes - it really gives a sense of the place