The Council may accept, reject or modify the recommendations of the Planning Commission and, upon granting such relief, attach such conditions as they deem appropriate to any approval. Approval may be conditioned upon the grant of relief (i.e., dimensional variances, etc.) by the Zoning Hearing Board where same is required, but such conditional approval by Council shall not be binding on the Zoning Hearing Board, and any conditional use approval shall be deemed vacant if any requested relief is denied by the Zoning Hearing Board.