Never seen it here in Pittsburgh. I have seen a bank bidding against a buyer on a mortgage foreclosure, seen the buyer go over the bank's max bid, and then seen the bank acting as the plaintiff stop the sale and request to postpone the sale to another date, voiding the bidding up to that point and returning the property to its opening bid the next time it's exposed for sale, with the bank as plaintiff paying the postponement and advertising fees.
This happens when a bank owns first and second mortgages on a property, and it's the first mortgage that has forced the foreclosure sale, and the judgment for the first mortgage was a pittance while the second mortgage is for serious money. If the bank lets the bidding buyer have the house, the second lien is wiped off the books.
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This will be clearer with an example. Let's say Joseph and his blushing bride Tina get a mortgage for $300,000 and buy a very nice house in a nice part of town in 1997. By 2007, they only owe $141,000 on the original mortgage. But the house has appreciated significantly and now appraises at $620,000. Tina and Joseph go back to the same bank and get a home equity loan for $360,000 to buy a turnkey rental property in Jacksonville run by an extremely reputable management company that provides a steady $200 in cashflow a month, great passive investment with excellent appreciation potential, just like the BP community told her.
For the next five years they continue to pay off the original mortgage and the home equity loan, and by 2013 they owe $70,000 on the original mortgage and $305,000 on the home equity loan. Joseph loses his "good" job and ends up in the slam in 2014 because he went that stupid, stupid house with wine coolers and condoms to meet an underage boy he found online. There was no boy, but all these guys with cameras ran out of the bushes...
Tina hangs on, hoping against hope that the story Joseph told her about just being curious and wanting to "counsel the boy at a difficult time in his life" isn't the biggest self-loathing cockamamie lie she's ever heard in her life. But alack, alas, Tina was never particularly good with money and "forgot" to pay the original mortgage while consistently paying off the (higher) payment for the home equity loan. When Joseph finds out about this, distraught, she shrugs and snaps, "Well, isn't it all going to the same bank anyway? If you didn't want us in this situation, why did you buy those condoms, Joseph? WHY DID YOU DO THIS TO YOUR KIDS, JOSEPH?"
The house goes to auction.
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Rather than overbid well above the amount of the judgment that led to this foreclosure, the lawyers will just start the process over again and hope that the bidder will find another property to spend their money on in the interim and won't be in the auction room next month to try to get a cheap deal on a $730,000 house, allowing the bank to acquire Joseph and Tina's house for minimal additional cost to their exposure from both the mortgage and the home equity loan.