Paying off the mortgage does not necessarily make a house free from every claim against it. If the property belongs to a homeowners association, unpaid assessments can create a lien even after the bank has disappeared from the picture.
That distinction matters because an HOA lien can interfere with a sale or refinance, and some state laws allow an association to pursue foreclosure under certain circumstances. Colorado provides a striking example: ProPublica and Rocky Mountain PBS found HOA foreclosure cases involving liens as small as $308 before the state changed its rules.