Iowa Code § 589.8
A release or satisfaction of a mortgage or trust deed, or of an instrument in writing creating a lien upon real estate where the release or satisfaction has been recorded in the recorder's office of the county in this state, or upon the margin of the record, where the original instrument was recorded and which release or satisfaction was made by an individual, association, partnership, assignee, corporation, attorney in fact, or by a resident or foreign executor, administrator, referee, receiver, trustee, guardian, or commissioner, and which release or satisfaction was executed, filed, and recorded more than ten years earlier, is valid, legal and binding, any defects in the execution, acknowledgment, recording, filing, or otherwise of the releases or satisfactions to the contrary notwithstanding.
Iowa Code § 589.8
84 Acts, ch 1090, §7; 91 Acts, ch 183, §17; 2008 Acts, ch 1032, § 106