California Code, Public Resources Code - PRC § 5797.6

(a) Be replacement park property of comparable recreational and open space characteristics and of equal or greater size.

(b) Be located in an area accessible for use by the same general population that used the disposed property.

(c) Include replacement facilities of the same type and number, as applicable, with development costs for the replacement property and facilities being substantially equivalent to the value of the disposed property.  This subdivision shall not be construed to require the replacement property to include a residential building.