(a) In all Residence Districts any use of a building structure, all or substantially all of which is designed or intended for a use permitted only in a Residential District, but is being used for a use permitted only in a Business or an Industrial District, shall be terminated within five (5) years of the effective date of this Ordinance.
(b) In all Business Districts any use of a building or structure, all or substantially all of which is designed or intended for a use permitted only in a Business District, but is being used for a use permitted only in a Residential or an Industrial District, shall be terminated within 10 years of the effective date of this Ordinance.
(c) In all Industrial Districts any use of a building or structure all or substantially all of which is designed or intended for a use permitted only in an Industrial District, but is being used for a use permitted only in a Residential or a Business District, shall be terminated within 15 years of the effective date of this Ordinance.
(d) The nonconforming use of land shall be discontinued and cease three (3) years from the effective date of this Ordinance:
Where no buildings or structures are employed in connection with such use;
When the only buildings or structures or other physical improvements are accessory or incidental to such use.