It's an area known as "Billionaire's Dirt Road" in North Salem, NY and until last week, I'd never heard of it. It's odd, too, because I grew up just seven miles away in Brewster, NY. You would think that somewhere along the way, I would've at least gotten a whisper of a tiny enclave of power and money, but not so much.
I assume it makes sense for billionaires to keep a low profile -- they don't buy homes in the country for attention. North Salem is a wealthy community, that's no secret, and its proximity to I-684 makes it popular with commuters who work in Manhattan.