Playboy Mansion: Guy Next Door Buying 'Girls Next Door' Home

Hugh Hefner has sold the Playboy Mansion ... and turns out it's to the guy next door.

Hef's neighbor, Daren Metropoulos, is in escrow to purchase the property. No one's saying how much it's going for ... but we're told it's north of $100 mil.

Hef put his famed Holmby Hills estate on the market in January with a hefty $200 million price tag. The buyer also had to agree to let him live there for the rest of his life.

Daren, whose father is billionaire C. Dean Metropoulos, bought the property next door back in 2009 for $18 mil. We're told he's a huge fan of the neighborhood and intends on keeping the exterior of Hef's home the way it is now. The inside is super dated, and it will almost certainly be gutted and restored.

Daren's family used to own Pabst Brewing Company. He's a big L.A. party guy, so it's not hard to read between the lines ... the allure of the mansion and the parties will go on.