California Code, Public Resources Code - PRC § 5540

(a) A district may take by grant, appropriation, purchase, gift, devise, condemnation, or lease, and may hold, use, enjoy, and lease or dispose of real and personal property of every kind, and rights in real and personal property, within or without the district, necessary to the full exercise of its powers.

(b) Lands subject to the grant of an open-space easement executed and accepted by the district in accordance with this article are enforceably restricted within the meaning of Section 8 of Article XIII of the California Constitution.  An easement or other interest in real property may be dedicated for park or open-space purposes, or both, by the adoption of a resolution by the board of directors, and any interest so dedicated may be conveyed only as provided in this section.

(c) A district shall not validly convey any interest in any real property actually dedicated and used for park or open-space purposes, or both, without the consent of a majority of the voters of the district voting at a special election called by the board and held for that purpose.  Consent does not need to be obtained for a lease of any real property for a period not exceeding 50 years; and consent does not need to be obtained for a conveyance of any real property if the Legislature, by concurrent resolution, authorizes a conveyance after a resolution of intention has been adopted by at least a two-thirds vote of the board of directors of the district, specifically describing the property to be conveyed.