Selena Gomez is saying so long to her lavish Los Angeles-area home … listing the massive estate for a cool $6.5 million … TMZ has learned.

Real estate sources tell TMZ … the pop star’s pad, tucked behind a gated, private driveway in Encino’s exclusive Rancho enclave, boasts 6 beds, a whopping 10 baths, and roughly 11,500 square feet of living space.

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We’re told the place, which was once owned by late rock legend Tom Petty, hit the market Friday with all the amenities you’ve ever dreamed of … plus some you never knew you needed.

It’s got all your standards … spacious living room, gorgeous kitchen, formal dining room — but there’s some swanky celeb stuff, too.

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We’re talking a wine cellar, media room, massage room, glam room, gym, workspace, and even a vocal booth.

Outside, the nearly one-acre grounds bring the wow factor with a waterfall and a stream flowing straight into the pool and spa.

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So why ditch a place like this? We broke the story … Selena and her hubby Benny Blanco scooped up a Beverly Hills mansion last year … dropping a casual $35 million.

So yeah … if you’ve got a spare mountain of cash lying around, Selena’s spot is up for grabs.

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Come and get it while you can!!

Branden Williams of Beverly Hills Estates holds the listing.