The first thing I would suggest is to file a lien to protect whatever interests the Assoc has. Second - notify every interested party of the lien and get them a copy of same. Finally, get some legal advice from a lawyer in WI.
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You can place a lien on the property for the unpaid fees but you should work with a local attorney to make sure you do not violate any laws.
Disclaimer: This answer does not constitute legal advice. I am admitted in the States of New York, New Jersey and Massachusetts only and make no attempt to opine on matters of law that are not relevant to those three States. This advice is based on general principles of law that may or may not relate to your specific situation. Facts and laws change and these possible changes will affect the advice provided here. Consult an attorney in your locale before you act on any of this advice. You should not rely on this advice alone and nothing in these communications creates an attorney client relationship.