521 Park Avenue
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521 Park Avenue

Condo in Lenox Hill
View the CityRealty Profile of 521 Park Avenue
January 26, 2018

$9M Upper East Side duplex is dressed up like a Park Avenue socialite

Besides being an architectural gem, designed by William Alciphron Boring and completed in 1911, 521 Park Avenue is the rare classic pre-war Upper East Side building that's also a condominium (it was converted in 1987). This sprawling duplex is the result of a high-floor two-unit combo. The resulting 3,000+ square-foot corner apartment has as much space and impressive pre-war detail as you'd expect from an address like this one.
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