(3) The owner of a future development unit is liable to pay contributions levied by the body corporate under this section from the date that the future development unit is first in use as a place of residence or business or otherwise and from that date that future development unit is to be treated as a principal unit for the purposes of this section.
(4) Any levies imposed by a subsidiary body corporate must be sufficient to pay any levies raised under subsection (1) by the head body corporate, its parent body corporate, or any other parent body corporate located between the subsidiary body corporate and its head body corporate.