Cal. Civ. Code § 4095

4095.    (a) “Common area” means the entire common interest development except the separate interests therein. The estate in the common area may be a fee, a life estate, an estate for years, or any combination of the foregoing. (b) Notwithstanding subdivision (a), in a planned development described in subdivision (b) of Section 4175, the common area may consist of mutual or reciprocal easement rights appurtenant to the separate interests.