Section 523.253 - Written offer, requirements - explanation of determination of property value1. A condemning authority shall present a written offer to all owners of record of the property. The offer must be made at least thirty days before filing a condemnation petition and shall be held open for the thirty-day period unless an agreement is reached sooner. The offer shall be deposited in the United States mail, certified or registered, and with postage prepaid, addressed to the owner of record as listed in the office of the city or county assessor for the city or county in which the property is located. The receipt issued to the condemning authority by the United States Post Office for certified or registered mail shall constitute proof of compliance with this requirement; provided, however, that nothing in this section shall preclude a condemning authority from proving compliance with this requirement by other competent evidence. Nothing in this section shall prohibit the parties from negotiating during the thirty-day period.2.(1) Any condemning authority shall, at the time of the offer, provide the property owner with an appraisal or an explanation with supporting financial data for its determination of the value of the property for purposes of the offer made in subsection 1 of this section.(2) Any appraisal referred to in this section shall be made by a state-licensed or state-certified appraiser using generally accepted appraisal practices.