Adam Levine's back in business -- the luxury house-flipping business -- and he's looking to make millions on his incredible home in Beverly Hills.
The Maroon 5 frontman and his wife, Behati Prinsloo, bought the massive pad from "Will and Grace" creator Max Mutchnick just over a year ago for a cool $35.5 million ... and just put it back on the market.
We're told the couple put $7 million into a complete remodel with a world-famous designer and are now listing it at $47.5 mil. Do the math ... pretty nice profit for a year's work.
The estate -- listed by super real estate agent Kurt Rappaport -- is located on an iconic street in Bev Hills and is over 10,000 square feet of awesomeness ... including a gym, spa, guest house, resort-like pool, 2 kitchens (one just for the chef), a professional screening room, 12 bathrooms and 5 bedrooms ... including a 2,000 sq. ft master suite.
Oh, and Pete Sampras used to live there too, so it also comes with the famous tennis court he installed.