Where a non-arm's length lease is rejected as a measure of damages for late completion of building works, the entire rental structure must be replaced with an arm's length market rental figure — it is impermissible to accept one component (base rent) at its actual level while substituting an arm's length figure for another component (turnover rent). Expert opinions that state conclusions without disclosing the reasoning process cannot support factual findings, even where the opinion is unchallenged.
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