Once completed, note the SST number and come into our office to finish the process. How to fill out the Payoff Request Letter Templates?On this page below is a list of LOCAL forms that can be completed online and then printed. The form you need may be in this list. The City of San José processes requests for payoff demands of existing homebuyer and home repair loans, and affordability restrictions (i.e. A mortgage payoff letter can come in two forms. One form tells borrowers the remaining principal amount and interest they have to pay to close out the loan.