Cal. Civil Code § 1580 : Nature Of A Contract — California Civil Code — Obligations — Consent — Mutual consent Date: 14 Sep 2016 TEXT PDF Current through the 2016 Legislative Session Consent is not mutual, unless the parties all agree upon the same thing in the same sense. But in certain cases defined by the Chapter on Interpretation, they are to be deemed so to agree without regard to the fact. Ca. Civ. Code § 1580