In the case that a Private Contract is to be to utilized, the Selling Agency shall offer to assist the Purchaser with the option to have the Private Contract ratified by the Notario Publico, including advising of their obligation to (a) pay the ISABI tax (b) obtain a certificate of no liens on the property to be noted in the Private Contract, (c) assure that all Utilities are paid in Full and supply proof of payment and (d) provide a Certificate of No Property Taxes Due.