No building or structure erected or structurally altered within the B-4 Central Business District and for which a building permit is issued shall exceed a height of 35 feet. The height of such building or structure may be increased by special exception, upon petition to and recommendation of the Plan Commission, and upon the favorable two-thirds vote of all of the members of the Common Council. A request for such special exception shall be subject to the petition, public hearing, notice and determination procedures applicable to a petition for conditional use permit under §
485-91. In considering such petition for special exception, the Plan Commission and Common Council shall be guided by the standards contained in §
485-134 relating to site plan and design review and by the criteria contained in §
485-138 relating to approval of building, site and operational plans; provided, however, that such building or structure shall not be eligible for the height regulation exceptions set forth in §
485-64 nor be eligible for the height increase permitted under §
485-65.