Sagaponack

Where founders dream of living

Sagaponack’s 11962 zip code was rated the nation’s most expensive place to live, with a median sales price of $8.5 million, according to PropertyShark.com. The tony Hamptons hamlet easily topped Atherton, Calif. — the most expensive spot in Silicon Valley with a median sales price of $5.9 million — and Beverly Hills, where prices had a mid-point of $3.5 million. Bridgehampton ($2.95 million), Shelter Island Heights ($2.79 million) and Water Mill ($2.67 million) also made…