Iowa Code § 725.4: Leasing premises for prostitution.

A person who has rented or let any building, structure or part thereof, boat, trailer or other place offering shelter or seclusion, and who knows, or has reason to know, that the lessee or tenant is using such for the purposes of prostitution, and who does not, immediately upon acquiring such knowledge, terminate the tenancy or effectively put an end to such practice of prostitution in such place, commits a serious misdemeanor.