Barack and Michelle Obama Buying Mega-Mansion in Martha's Vineyard -

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Barack and Michelle Obama may soon become Kennedy adjacent because we've learned they're in escrow for a remarkable, mega-expensive, Martha's Vineyard estate.

Multiple island sources tell us the Obamas are in escrow for the estate owned by Boston Celtics owner, Wyc Grousbeck. The former Prez and First Lady have been renting the house this summer and loved it so much, we've learned they made an offer. The property is listed at $14,850,000. Our sources say they're paying less, but we don't know how much.

The estate -- incredible. It's 29 beachfront acres. The main residence is just shy of 6,900 square feet. It has 7 bedrooms, so Sasha and Malia have a place to crash, along with several of their friends. It has the obligatory pool, an outdoor fireplace, a chef's kitchen, vaulted ceilings and 2 guest wings. It has incredible views, especially while soaking in the second-floor balcony Jacuzzi.

The beachfront is private ... and comes with a boathouse.

Downside -- only a 2-car garage!!! Sorry kids.

The estate is listed by the realtors who dominate the area -- Tom LeClair and Gerret Conover. They did not return our calls.

The estate is currently in escrow and it's not a done deal just yet. We're told there are contingencies so it's possible it could fall apart, but we're told so far it's a go.