In Victoria Australia Harry saw an advertisement for an apartment for sale "off the plan" with "massive stamp duty savings". On Saturday Harry signed a Section 32 disclosure statement of the Sale of Land Act 1962 - Victoria and a contract of sale, and paid 5% deposit. On Wednesday following, Harry appointed you as his conveyancer. Special Condition 100 of the contract required Harry to pay "up to 10% of additional construction costs if the construction was over the building budget." The budget was not disclosed. Harry, dismayed, wished he had never signed. Advise.