Iowa Code § 654.26: No deficiency judgment in certain cases.

If the plaintiff has elected foreclosure without redemption, the plaintiff may include in the petition a waiver of deficiency judgment. If the plaintiff has elected foreclosure without redemption and does not include in the petition a waiver of deficiency judgment, if the mortgaged property is the residence of the mortgagor and is a one-family or two-family dwelling, and if the mortgagor does not file a demand for delay of sale under section 654.21, then the plaintiff shall not be entitled to the entry of a deficiency judgment under section 654.6.