"What is a wrap-around mortgage, and who is it good for?"
A wrap-around mortgage is a loan transaction in which the lender assumes responsibility for an existing mortgage. For example, S, who has a $70,000 mortgage on his home, sells his home to B for $100,000. B pays $5,000 down and borrows $95,000 on a new mortgage. This mortgage "wraps around" the existing $70,000 mortgage because the new lender will make the payments on the old mortgage.
A wrap-around is attractive to lenders because they can leverage a lower interest rate on the existing mortgage into a higher yield for themselves. For example, suppose the $70,000 mortgage in the example has a rate of 6% and the new mortgage for $95,000 has a rate of 8%. The lender’s cash outlay is $25,000 on which he earns 8%, but in addition he earns the difference between 8% and 6% on $70,000. His total return on the $25,000 is about 13.5%. To do as well with a second mortgage, he would have to charge 13.5%. I have a spreadsheet on my web site that calculates the yield on a wrap-around.
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