TR - You probably just do not do that type of lending and are therefor unfamiliar with it, but as KB said, it is quit common. It happens as Hallie indicated, however you don't just put up the underlying property as collateral, you also pledge the note which the property secures. The bank is not buying nor do they have any responsibility to collect on the underlying loan, that is left to the original lender (usually a private party). You are just taking the loan and associated mortgage as your collateral.
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