There may be imposed by local ordinance a requirement that areas of real property within the subdivision be reserved for parks, recreational facilities, fire stations, libraries, or other public uses, subject to the following conditions:
The reserved area shall conform to the adopted specific or general plan and shall be in such multiples of streets and parcels as to permit an efficient division of the reserved area in the event that it is not acquired within the prescribed period; in such event, the subdivider shall make those changes as are necessary to permit the reserved area to be developed for the intended purpose consistent with good subdividing practices.
Ca. Gov. Code § 66479