The NY Times engages in the guilty pleasure of checking out how my Bel-Air neighbors live in their 40,000 square foot homes. This is "50 Shades of Green". One quote from the piece caught my eye;
"Mr. Landry learned how to design for the special needs of the rich and famous. Two kitchens, one for family and one for staff. Large, open foyers with direct flow to give fund-raiser crowds easy access to the backyard. Wings that could be closed off, so that a large house becomes a series of smaller ones, inhabited by the owners, extended family and houseguests. And amenities like home theaters and spas that account for all that square footage — and, more important, make interaction with the public avoidable."
Read that last sentence again. The point of the mega-homes is to create an urban oasis so that you can access the city when you want to but to recreate the city's retail strip within your home so that you don't have to interact with guys like me.