A nonconforming use is hereby required to be maintained in such a condition as will not constitute a danger to the safety, health or general welfare of the public. Repair of the nonconforming use, in order to comply with the provisions of this section, will be permitted, provided that such repair shall not increase any inherent nuisance, nor be an extension or alteration of the structure, nor violate any provisions of this chapter regarding yards, lot area or lot coverage for the district in which it is situated or to increase any existing violations of such provisions. Failure to comply with these requirements shall cause a lawful nonconforming use to be automatically terminated when maintenance has not been completed within 12 months of notification of the owner by the Zoning Enforcement Officer.