Peek Inside The Apartments Of New York’s 1% #refinery29 www.refinery29.co… 20 East End Ave.Few things sound more exclusive than a residential enclave on the Upper East Side, but that’s precisely the point for 20 East End Ave. Nestled amidst the prominent 11-block stretch of the avenue — known for its high price point and even higher standard of living — the top-floor pent…