Cal. CIV § 811

A servitude is extinguished: 1. By the vesting of the right to the servitude and the right to the servient tenement in the same person; 2. By the destruction of the servient tenement; 3. By the performance of any act upon either tenement, by the owner of the servitude, or with his assent, which is incompatible with its nature or exercise; or, 4. When the servitude was acquired by enjoyment, by disuse thereof by the owner of the servitude for the period prescribed for acquiring title by enjoyment.