Iowa Code § 617.13: Real estate in other county.

When any part of real property, the subject of an action, is situated in any other county than the one in which the action is brought, the plaintiff must, in order to affect third persons with constructive notice of the pendency of the action, file with the clerk of the district court of the other county a notice of the pendency of the action, containing the names of the parties, the object of the action, and a description of the property in that county affected by the action. The clerk shall at once index and enter a memorandum of the notice in the encumbrance book.