The two-story Manhattan penthouse once owned by Frank Sinatra is on sale for $7.7 million. The luxury 3,200 square foot duplex was dubbed a "glittering grotto in the sky" by Andy Warhol. Sinatra entertained a long list of celebrities in the three bedroom property until he sold it in 1972. The apartment has a wrap-around terrace and "gorgeous views" of the East River.

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