(a) Upon the approval of a final plat, the developer shall within 90 days of such final approval or 90 days after the date of delivery of an approved plat signed by the governing body following completion of conditions imposed for such approval, whichever is later, record such plat in the office of the recorder of deeds of the county in which the municipality is located. Whenever such plat approval is required by a municipality, the recorder of deeds of the county shall not accept any plat for recording, unless such plat officially notes the approval of the governing body and review by the county planning agency, if one exists.

(b) The recording of the plat shall not constitute grounds for assessment increases until such time as lots are sold or improvements are installed on the land included within the subject plat.