1. Except as otherwise provided by this section, no structure may be erected   or changed so as to make its height greater than twenty-five (25) feet if it is in an R1 or R2 District, or thirty-five (35) feet if it is in an A, R3, HS, LB, GB or OD District, or one hundred (100) feet if it is in a CB or I District.
  2. A clinic that is authorized as a special use under section 4.1 may be erected or changed to a height not greater than forty (40) feet.
  3. In a GB District, a business or light industrial structure may be erected or changed to a height not greater than seventy-five (75) feet.  In a CB or I District, a business or industrial structure may be erected or changed to any height.  This height exception does not extend to signs permitted for these uses.
  4. An agricultural structure may be erected or changed to any height necessary for its operation.
  5. The following structures may be erected or changed to any height not greater than thirty-five (35) feet when permitted in an R1 or R2 District:
    1. Churches or temples (excluding signage)
    2. Public Libraries or museums
    3. Schools
    4. Government Buildings
  6. Spires, church steeples, chimneys, cooling towers, elevator bulkheads, fire towers, scenery lofts, penthouses for mechanical equipment, stacks, tanks, water towers, transmission towers for electric lines, and necessary mechanical appurtenances may be erected or changed to any height that is not otherwise prohibited elsewhere in this ordinance.