The City Council may, at its discretion, review any affirmative decision of the Board of Adjustment at any time before the effective date of the decision. After such review, but prior to the effective date of the decision, the Council may remand any such decision to the Board of Adjustment for further review. Upon remand, the Board of Adjustment may reconsider its decision and issue its final decision on the request within 30 days after the date of such remand.