CA Gov't Code Section 16143

Land shall be deemed to be devoted to open-space uses of statewide significance if it:

(a)

Could be developed as prime agricultural land, or

(b)

Is open-space land as defined in Section 65560 which constitutes a resource whose preservation is of more than local importance for ecological, economic, educational, or other purposes. The Secretary of the Resources Agency shall be the final judge of whether the land is in fact devoted to open-space use of statewide significance.