From my understanding a special levy (as opposed to normal body corporate fees) which is struck before the date of the contract is required to be paid by the seller.
Where special levies are paid by instalments, my understanding is that all instalments must be paid by the seller (?). If a special levy is struck after the date of the contract then that its adjusted between seller and buyer.
Presumeably an inspection might show if there is an intention to raise a special levy that may be struck after the date of the contract. Ultimately due diligence is required where there is a risk of this occurring.