Cal. Gov. Code § 51119.5
Parcels zoned as timberland production under this chapter may not be divided into parcels containing less than 160 acres unless the original owner prepares a joint timber management plan prepared or approved as to content by a registered professional forester for the parcels to be created. The joint timber management plan shall provide for the management and harvesting of timber by the original and any subsequent owners, and shall be recorded with the county recorder as a deed restriction on all newly created parcels. The deed restriction shall run with the land rather than with the owners, and shall remain in force for a period of not less than 10 years from the date division is approved by the board or council. The division shall be approved only by a four-fifths vote of the full board or council, and only after recording of the deed restriction.
Ca. Gov. Code § 51119.5