Where a proposed park, playground or other recreational area, proposed school site or other public ground that has been indicated in the official map and/or master plan is located in whole or in part within a proposed subdivision, such proposed public site shall be designated as such and should be dedicated to the city, school district or other proper governmental unit. If the subdivider chooses not to dedicate an area in excess of the land required under this chapter for such proposed public site, the council shall not be required to act to approve or disapprove the plat of the subdivision for a period of ninety (90) days after the subdivider meets all the provisions of this title in order to permit the council, school board or other appropriate governmental unit to consider the proposed plat and to take the necessary steps to acquire, through purchase or condemnation, all or part of the public site proposed under the official map or master plan. (1981 Code 301 § 6)