The approval of a final development plan for a planned unit development district shall be for a period not to exceed one (1) year to allow for preparation and recording of the required subdivision plat and the development of the project. If no construction has begun within one (1) year after approval is granted, the approved final development plan shall be void and the land shall revert to the district regulations in which it is located. An extension of the time limit or modification of the approved final development plan may be approved if the Planning Commission finds that such extension or modification is not in conflict with the public interest.
No zoning amendment passed during the time period granted for the approved final development plan shall in any way affect the terms under which approval of the planned unit development was granted.