The ACT Court of Appeal held that a common assumption shared between the original parties to an option deed (that a development application would be lodged before exercise) could not support the implication of a contractual term, rectification, or estoppel against a nominee purchaser who was not party to the original negotiations. The contract's express provisions satisfactorily accommodated the scenario where no development application was made, yielding an $8 million purchase price rather than $10 million, and the entire agreement clause reinforced that the written terms governed. The Court left open whether clause 38.4 of the contract might entitle the vendor to a future price adjustment if the purchaser later made a change of use application.
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