In any case where a special use has been established within one year after the date of granting thereof, then, without further action by the Plan Commission or the corporate authorities, the special use or authorization thereof shall be null and void and if in connection with such planned development, the property was rezoned from one zoning district to a different zoning district, then the zoning classification shall automatically revert to that existing prior to the grant of a special use. For the purpose of this Zoning Title a special use is established if a building permit for the project or part thereof is secured within one year from the effective date hereof, granting the special use; provided, however, that if construction on a special use is discontinued for a period of one year or more, or if progress on any stage of a planned development falls behind the schedule for construction (if any is approved as part of the Village ordinance approving the special use) by more than one year, then the uncompleted portions of the planned development will be subject to review by the corporate authorities, who will have the authority to revoke the special use permit for the uncompleted portions. (1983 Code)