(1)  An occupancy permit in respect of a building remains in force until –

(a) another occupancy permit in respect of the building is issued under this Act; or

(b) it is cancelled.

(2)  For the avoidance of doubt –

(a) the issue of an occupancy permit in respect of part of a building does not affect the validity of an occupancy permit in respect of another part of the building; and

(b) the sale or lease of a building does not, in itself, affect the validity of an occupancy permit in force in respect of the building.