What can I do about weed liens filed by the City on someone else that owned the property?

30 YO weed liens? I doubt any title company would still consider them valid, but if so then contact the Beaumont City Attorney's office to obtain releases.

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Liens on the property pass to new owners. I assume these are fines for high weeds? You will either need to pay them or seek a court order to release you from the obligation. Depending on the amount owed it may be easier to just pay them off.