The suburbs are MUCH BETTER for multi million dollar homes. For $8 million, you can get 7 bedrooms (meaning you can use one as a guest bedroom, one as a maids room, etc.), 7 bathrooms (1 or 2 with separate bathtub & shower stall), formal living room, eat in kitchen with all the modern finishes , dining area, breakfast nook, 2nd kitchen, laundry room, grand staircase, marble floors, carved wood inlay, high ceilings (some carved), space for an office, gym and for a bonus - an indoor swimming pool!
Now for the outside features - how about a waterfront property facing the Hudson River or Long Island Sound & you'll have a dock for your yacht. Also your property will have a tennis court and you'll be a member of one of Westchester's exclusive golf clubs. Your neighbors will be a little distance instead of next door like in a building. Your children will attend free public schools which is among the best in the U.S. instead of paying for private schools. But you pay high property taxes to support these fine public schools unlike NYC's public schools that need improvement.
As for your neighbors, you can live next to the Clintons, Martha Stewart, Susan Sarandon and other celebs or you can live next to some of Wall Street's high powered executives or lawyers.