The deal was that the future homebuyer was told to go ahead and get the adjustable rate mortgage, or the mortgage with the huge balloon payment at the end, because they would be able to renegotiate another teaser rate ARM when the present one came due. This did not happen, and they were stuck in a $300K house with a mortgage that would require them to pay $500K or more according to its terms that was worth maybe $200K at most.
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About six years ago, a colleague of mine, a somewhat naive Education professor told me that when she got a divorce from her husband, some guy popped up from nowhere and told her that she should get a new, better mortgage. Lower payments, better interest rates and the like.
So she signed all the paperwork, and it turns out that according to her new bank she must now pay $120 a month more on a 30 year ARM mortgage instead of 25 years more on her previous fixed rate one.
Then she asks me "Is that legal? How can they do that?"
I said, "If it's on paper and you signed it, it's probably legal. Anything they told you that isn't in writing is unlikely to be taken seriously by a court. I am not a lawyer, I don;t know how they get away with this sort of thing, but I am sure that they could do it legally if they wrote it to benefit themselves. I am not a lawyer, but if I were you, I think I'd find one."
I am not sure what happened after that.
I am guessing that she got diddled, and was not the first or the last of the diddlees.