In this Part, a reference to an existing building (including an existing dwelling ) on an adjoining allotment is a reference to a building—
(a) that was in existence in its current completed form before 1 July 1994; or
(b) for which there is an occupancy permit, a copy of which has been given to the relevant council; or
(c) for which there is a certificate of final inspection, a copy of which has been given to the relevant council (but only if that part of the building can be occupied without the need for any further certificate of final inspection); or
(d) that has been completed (but only if the building can be occupied without the need for an occupancy permit or a certificate of final inspection).