Civ. Code, § 816.56

Only the following entities or organizations may acquire and hold a greenway easement:

(a) A tax-exempt nonprofit organization qualified under Section 501(c)(3) of the Internal Revenue Code and qualified to do business in this state that has as its primary purpose the preservation, protection, or enhancement of land in its natural, scenic, historical, agricultural, forested, or open-space condition or use, or the preservation or development of a greenway.

(b) The state or any city, county, city and county, district, or other state or local governmental entity, if otherwise authorized to acquire and hold title to real property and if the greenway easement is voluntarily conveyed. A local governmental entity shall not condition the issuance of an entitlement for use on the applicant’s granting of a greenway easement pursuant to this chapter.

(c) A federally recognized California Native American tribe or a nonfederally recognized California Native American tribe that is on the contact list maintained by the Native American Heritage Commission to protect a California Native American prehistoric, archaeological, cultural, spiritual, or ceremonial place, if the greenway easement is voluntarily conveyed.