Iowa Code § 572.6: In case of leasehold interest.

When the interest of such person is only a leasehold, the forfeiture of the lease for the nonpayment of rent, or for noncompliance with any of the other conditions therein, shall not forfeit or impair the mechanic’s lien upon such building or improvement; but the same may be sold to satisfy such lien, and removed by the purchaser within thirty days after the sale thereof.