A Calderbank offer that does not specify a commencement date for interest, or is unclear as to the principal amount on which interest is payable, may be found to be ambiguous and therefore not a valid Calderbank offer. Where reasonable minds might differ on the meaning of a term in a Calderbank offer, a finding of ambiguity will not be disturbed on appeal. Practitioners drafting Calderbank offers should avoid juxtaposing party-party costs terms with references to solicitor-client costs.
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