Any time prior to the expiration of a vesting tentative map, the subdivider, or his or her assignee, may apply for an amendment to such map. A public hearing shall be held by the planning commission or any amendment involving a substantial modification to the subject subdivision or development related thereto. The planning commission may approve, conditionally approve or disapprove the proposed amendment. The decision by the planning commission on the requested amendment shall be appealable to the city council in the manner provided by section 10-2-205 of this chapter. (Ord. 88-O-2034, eff. 8-4-1988)