Start with the address and any property-tax notice, parcel number, creditor letter, payoff statement, recorded deed or mortgage, or sale notice you have. Sellers can call before they have everything; you do not have to resolve the record before starting a conversation.
The County Tax Collector can answer questions about its secured-property-tax account. A mortgage servicer or other creditor provides its own current payoff and release instructions. The title company checks recorded claims and works with the relevant parties on the title and payoff items for the sale. The County Assessor is a starting point for assessed-value and parcel questions, not a current lien payoff.
Call 888-274-5006 or use the form above with whatever information you have.