It is unlawful to lease, let or permit any building or premises, boat or floating structure to be used, in whole or in part, as a house of ill-fame, or house of assignation, or place for the practice of fornication or adultery, or to lease any building or premised for a lawful purpose that may afterwards, with lessor’s knowledge be converted, in whole or in part, into the immoral uses and purposes above set forth.
(1980 Code, § 31.142)  Penalty, see § 131.99