1. Disclose any known illegal structures (so purchaser will not sue you).
2. Sell for more than what you owe the bank (anything less the bank will not let you settle).
3. Sign the discharge of mortgage (you must let the bank know as it is their money that you borrow).
4. Sign the transfer (This is you must let the government know that you have sold your property).
5. Collect your money.

There is nothing more to do. Why do you want to complicate yourself?