In the event the county or city fails to seek an injunction against any threatened construction or other development or activity on the land which would violate the easement or to seek a mandatory injunction requiring the removal of any structure erected in violation of the easement, or if the county or city should construct any structure or development or conduct or permit any activity in violation of the easement, the owner of any property within the county or city, or any resident thereof, may, by appropriate proceedings, seek such an injunction.
Ca. Gov. Code § 51086