If you are planning to sell your HOA property, you must submit an HOA demand payoff letter. Here's an in-depth explanation of the entire process.Branch Locations, Directions and Hours. Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started. I have recently purchased and financed a used car from a dealer. I have financed the vehicle through a large bank. 1) Call the mortgage department and request an official principal payoff letter. This is a standard form of payoff letter. Payments should be made payable to Clark County Treasurer-SID.