The waters of Cape Cod Bay are coming for the big brown house perched on the edge of a sandy bluff high above the beach. It’s just a matter of when.

Erosion has marched right up to the concrete footings of the multimillion-dollar home where it overlooks the bay. Massive sliding doors that used to open onto a wide deck, complete with hot tub, are now barricaded by thin wooden slats that prevent anyone from stepping through and falling 25 feet to the beach below.

The owner knew it. He removed the deck and other parts of the house, including a small tower that held the primary bedroom, before stopping work and falling into a standoff with the town. He’s since sold the place to a salvage company, according to his attorney, that says it won’t pay for work.