For the purposes of this Act, a person sells a building unit if:
(a) in a case where:
(i) the building unit is covered by subsection 372S(2), but is not covered by subsection 372S(3); and
(ii) the person holds a freehold interest in the land on which the building unit is situated;
the person transfers the whole or a part of the freehold interest; or
(b) in a case where:
(i) the building unit is covered by subsection 372S(2), but is not covered by subsection 372S(3); and
(ii) the person holds a leasehold interest in the land on which the building unit is situated;
the person transfers the whole or a part of the leasehold interest; or
(c) in a case where:
(i) the building unit is covered by subsection 372S(3); and
(ii) the person holds an interest in the unit;
the person transfers the whole or a part of the interest in the unit.