California, United States of America
The following excerpt is from Builders v. Saur, D068860 (Cal. App. 2016):
Extrinsic evidence of the parties' intent includes "objective matters as the surrounding circumstances under which the parties negotiated or entered into the contract; the object, nature and subject matter of the contract; and the subsequent conduct of the parties." (Morey v. Vannucci (1998) 64 Cal.App.4th 904, 912.)
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