Height limitations of this Ordinance shall not apply to chimneys, church spires, clocks or bell towers or other similar architectural design elements, public monuments, or wireless transmission towers, provided that such structures do not exceed 20 feet above the maximum height in the district in which they are located. Architectural features which include building and roof line elements which are intended to add architectural interest and not for the purpose of adding signage to the building may be allowed to exceed the maximum height of the district by not more than 20 feet with Commission approval. The footprint of that portion of the structure which is encompassed by the proposed building and/or roof line element shall not exceed 25 percent of the footprint of the total structure. The Commission may specify a lower height limit for any structure that requires approval as a Conditional Use. In determining the appropriate height, the Commission shall consider the character of the surrounding uses, the height of surrounding structures, the potential to obscure light or view to or from existing buildings and surrounding properties, and potential detriment to the use or value of surrounding properties.