Cal. Public Resources Code § 5407.1

Such substitute park land and facilities shall be of comparable characteristics and of substantially equal size located in an area which would allow for use of the substitute park land and facilities by generally the same persons who used the acquired park land and facilities. However, the operating entity, after holding a public hearing, with due notice posted at the park being acquired, and after finding on the basis of evidence submitted at such hearing that there are compelling reasons for acquiring a substitute park of a different character, may, upon the recommendation of the park commission or if none exists, upon the recommendation of the administrative department, unit or agency charged with the responsibility for the maintenance and operation of the park land and facilities, and by a three-fourths vote of its legislative body, provided it is otherwise legally permissible to do so, change the general character of the substitute park land and facilities.