In this Division, "owner" in relation to a dwelling, a sole occupancy unit or a building means—
(a) in the case of a dwelling, sole occupancy unit or a building being purchased under a terms contract (as defined in section 2 of the Sale of Land Act 1962 ) under which the purchaser has become entitled to possession or to the receipt of the rents and profits, the purchaser of that dwelling, sole occupancy unit or building; and
(b) in the case of any other dwelling, sole occupancy unit or building, the owner of that dwelling, sole occupancy unit or building.