Any municipal corporation or county is authorized to acquire by purchase, gift, or condemnation and to pay just compensation for any property rights in outdoor advertising signs, displays, and devices which were lawfully erected but which do not conform with the provisions of any lawful ordinance, regulation, or resolution or which at a later date fail to comply with the provisions of any lawful ordinance, regulation, or resolution due to changed conditions beyond the control of the sign owner. No municipal corporation or county shall remove or cause to be removed any such nonconforming outdoor advertising sign, display, or device without paying just compensation. Such compensation shall be paid in accordance with the conditions stated in Code Section 32-6-84. For the purposes of this Code section, the term "devices" means light, lighting fixtures, or other fixtures which are permanently attached to an advertising sign or display.