Nassau County Satisfaction of Mortgage Form. Fill in the blank form formatted to comply with all recording and content requirements.The Nassau County Clerk's Office maintains a record of all Nassau County real estate transactions that is available for public review. Looking to file a mechanics lien in Nassau County? Find the information you need to record your lien successfully with the Nassau County Clerk here. You can eRecord your documents online through Simplifile right now in Nassau County. The Office of the County Clerk does not supply deed, mortgage or satisfaction forms. Satisfactory. U, Unsatisfactory. UU, Unofficial Withdrawal For Non-Credit Courses. If the judgment is not a lien, it is possible that the lender or the title company may insist upon satisfaction at or prior to closing.