Eh, the wealthiest in America mostly live in spacious suburbs. They aren't very city-like, but they're not the same suburbs as GP mentioned either. In every wealthy metro, there will be a couple areas that the wealthiest coalesce around.
Think Hillsborough/Atherton/Palo Alto, Carmel IN, Newton/Brookline MA, Beverly Hills, Greenwich County CT, River Oaks in Houston, Boulder CO, Scottsdale AZ, etc