A LETTER: Mortgage Payoff 2nd Mtg is a document sent to the holder of a second mortgage loan informing them that the loan is being paid in full. This letter typically includes the name of the borrower, the loan amount, and the date of payoff. It may also include other details such as the loan interest rate and any fees associated with the payoff. There are two types of LETTER: Mortgage Payoff 2nd Mtg: one for a refinancing of the loan and one for a lump sum payment. Both types of letters are used to formally notify the loan holder that the loan is being paid in full.