Lawyer Sues Bank Over $5.5 Cap Cod Home Purchase

Can someone legally back out of a multi-million-dollar mortgage by claiming they weren't mentally capable of making the decision?

That's exactly what one retired New York lawyer is asking a federal court to decide.

John G. Bonomi Jr. is suing JPMorgan Chase after buying a $5.5 million waterfront mansion on Cape Cod that was already at risk of falling into the ocean. The home has since been demolished, but Bonomi says he shouldn't have to keep paying the nearly $3.9 million mortgage because he was experiencing a manic episode caused by Bipolar I Disorder when he purchased it.

A Luxury Home With a Very Expensive Problem

The five-bedroom, seven-bathroom home in Wellfleet, Massachusetts sat on a rapidly eroding bluff overlooking Cape Cod Bay. Experts estimated the cliff was disappearing by several feet every year.

Despite that, Bonomi bought the property in November 2021 for the full asking price of $5.5 million.

The home became famous because of its dramatic location and ongoing erosion concerns. After years of headlines, the house was demolished in early 2025 before it could collapse into the ocean. The demolition reportedly cost another $250,000.

Today, the land where the mansion once stood is worth only a fraction of what it once was.

Why He's Suing the Bank

Bonomi's lawsuit doesn't blame the seller. Instead, he's targeting JPMorgan Chase, arguing the bank should never have approved his mortgage.

According to court filings, Bonomi was diagnosed with Bipolar I Disorder in 2009. He says he was suffering from an uncontrollable manic episode when he signed the mortgage documents.

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His lawsuit argues that mania can cause impulsive decision-making, reckless spending, and irrational risk-taking. He claims "no rational person" would have agreed to buy the property at full price given the erosion issues.

Bonomi also alleges the bank either knew, or should have known, that he wasn't mentally capable of entering into the loan agreement.

He wants the court to cancel the remaining $3.85 million mortgage, along with interest, damages, and attorney's fees.

Can Mental Illness Cancel a Contract?

While the lawsuit may sound unusual, it isn't completely without legal support.

New York law does recognize that, in certain situations, a contract can be declared invalid if someone lacked the mental capacity to understand what they were agreeing to.

The challenge, however, is proving it.

Bonomi faces a difficult case because he'll have to show not only that he lacked the ability to make the decision, but also that the lender either knew about it or should have recognized it before approving the mortgage.

JPMorgan Chase has denied the allegations and is fighting the lawsuit.

A Case That Could Raise Bigger Questions

Mental health experts say it's entirely possible for someone experiencing mania to make impulsive purchases involving enormous amounts of money.

But the case also raises broader questions.

How much responsibility should lenders have to recognize signs that a borrower may not be capable of making major financial decisions? And where should the line be drawn between protecting vulnerable people and holding adults responsible for contracts they sign?

Those questions could ultimately be left for a jury to decide.

For now, one of Cape Cod's most talked-about homes is gone, but the legal battle over who should pay for it is just getting started.