What is the tender rule in the context of a trustee's sale action?

"Recognized exceptions to the tender rule include when: (1) the underlying debt is void, (2) the foreclosure sale or trustee's deed is void on its face, (3) a counterclaim offsets the amount due, (4) specific circumstances make it inequitable to enforce the debt against the party challenging the sale, or (5) the foreclosure sale has not yet occurred." (Chavez v. Indymac Mortgage Services (2013) 219 Cal.App.4th 1052, 1062.) "Because the action is in equity, a defaulted borrower who seeks to set aside a trustee's sale is required to do equity before the court will exercise its equitable powers. [Citation.] Consequently, as a condition precedent to an action by the borrower to set aside the trustee's sale on the ground that the sale is voidable because of irregularities in the sale notice or procedure, the borrower must offer to pay the full amount of the debt for which the property was security. [Citations.] 'The rationale behind the rule is that if [the

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