In many jurisdictions, a deed of trust is required in order to conduct a foreclosure by the power of sale. A deed of trust conveys the property from the mortgage holder to the trustee, who holds the property in trust for the mortgage holder. In the instance of foreclosure, the trustee, not the mortgage holder, conducts the sale of the mortgaged property. The trustee is generally instructed by the mortgage holder to foreclose on the mortgage and is under no obligation to determine whether this foreclosure is justified.

A deed of trust and trustee supervised foreclosure allows the mortgage holder to bid for the foreclosed property, provided the trustee and the mortgage holder are not closely associated. Otherwise, a mortgage holder cannot bid for the mortgaged property when the foreclosure is by power of sale.