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Perfectly Frank home swings!

Frank Sinatra's old duplex.

Frank Sinatra’s old duplex.

COME ‘BUY’ WITH ME: Frank Sinatra’s old four-bedroom duplex on East 72nd Street has “Old Man River” views and magical Rat Pack memories. It’s hitting the market next week for $7.7 million. (
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Start spreading the views.

Frank Sinatra’s swanky former Manhattan penthouse — where President John F. Kennedy, Marilyn Monroe and Andy Warhol once partied — is set to go on sale next week for $7.7 million, The Post has learned.

“The apartment has been modernized, but it is still set up for someone with that Rat Pack mentality,’’ said Jason Haber, broker for the 3,000-square-foot duplex on East 72nd Street. “It is really for someone who wants to entertain, to have people over, to have dinner parties.”

Warhol once called the pad “a glittering grotto in the sky.’’

The sprawling unit, which occupies the 22nd and 23rd floors, boasts two wraparound terraces totaling 2,000 square feet and a funky glass staircase.

It comes with bragging rights too — Ol’ Blue Eyes helped design the four-bedroom, six-bath apartment in 1961 during construction.

The swinging-single Sinatra, who divorced second wife Ava Gardner in 1957, threw wild bashes in the glassed-in, rooftop party room, where guests included fellow Rat Packers Dean Martin, Sammy Davis Jr., Peter Lawford and Joey Bishop.

They partied under 18-foot ceilings while gazing out on sweeping East River views.

During Sinatra’s soirees there, Davis loved to throw champagne glasses from the terraces to the FDR Drive below.

When Sinatra wasn’t entertaining, he used the party space for actual work, to “vocalize,’’ Haber said.

He met, married and then divorced Mia Farrow while there.

Sinatra kept the apartment until 1972, when he sold it to his celebrity doctor, Denton Cox, whose other patients included Warhol, Judy Garland and John Steinbeck.

But Cox didn’t keep the pad up, and after he died, his estate sold it to insurance magnate Penny Hart for $4.5 million in 2008. She made hefty renovations, including turning a section of the party room into the master bedroom.