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Mark Wahlberg 's about to score another blockbuster, but this one’s in real estate ... 'cause TMZ has learned the actor's under contract to buy a jaw-dropping estate in South Florida.

Sources with direct knowledge tell TMZ ... Wahlberg went into contract in mid-September to scoop up the $47 million, 7-bedroom, 12-bathroom compound in Delray Beach's exclusive Stone Creek Ranch ... known locally as "Billionaire's Row." Getty

The massive Italian contemporary pad spans more than 29,000 square feet overall, with nearly 18,000 square feet of living space ... all sitting on 2.5 lakefront acres. Fully furnished and meticulously crafted, the home blends Lake Como glamour with James Bond

"Casino Royale" vibes.

Inside, the mansion opens to a soaring two-story foyer leading to a grand

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