If you have them, bring the latest City property-tax bill or notice, a tax-lien-sale notice, mortgage or creditor payoff statement, court paper, and any recorded-property document. Start with the property address; you can call before every record is in hand.
NYC Department of Finance handles City property-tax bills, notices, and lien-sale information. The creditor or tax office confirms the current account and payoff instructions. The title company checks recorded property documents and works with the relevant parties on the documents and figures for closing.