California Code, Government Code - GOV § 54227

(a) In the event that any local agency disposing of surplus land receives a notice of interest to purchase or lease that land from more than one of the entities to which notice of availability was given pursuant to this article, the local agency shall give first priority to the entity or entities that agree to use the site for housing that meets the requirements of Section 54222.5.  If the local agency receives offers from more than one entity that agrees to meet the requirements of Section 54222.5, then the local agency shall give priority to the entity that proposes to provide the greatest number of units that meet the requirements of Section 54222.5.  In the event that more than one entity proposes the same number of units that meet the requirements of Section 54222.5, priority shall be given to the entity that proposes the deepest average level of affordability for the affordable units.  A local agency may negotiate concurrently with all entities that provide notice of interest for the purpose of developing low- and moderate-income housing that meets the requirements of Section 54222.5.

(b) Notwithstanding subdivision (a), first priority shall be given to an entity that agrees to use the site for park or recreational purposes if the land being offered is already being used and will continue to be used for park or recreational purposes, or if the land is designated for park and recreational use in the local general plan and will be developed for that purpose.