On the Upper East Side, one penthouse listing is proudly embracing its bold past.

A four-bedroom, four-bathroom aerie at 425 E. 63rd St. has listed for $2.89 million, and it looks like it’s hosting a cocktail party from the 1980s that never ended.

Spread across 2,725 square feet and encircled by a sweeping 1,295-square-foot wraparound terrace, the home is actually a combination of three units, fused together decades ago by its original owner, Fred — who declined to provide his full name — an art collector and self-taught interior designer who now rents the apartment from his nephews.

“It’s three apartments combined into one,” Fred, who originally purchased the first unit in 1978, told The Post. “I did the original design.” 13

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Fred, who now spends most of his time in Florida an

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