Missouri Revised Statutes Title XXVII. Debtor-Creditor Relations § 429.605. Broker's lien for compensation for services, requirements

(1) Such real estate is listed with the real estate broker under terms of a written agreement for the purpose of selling, leasing or otherwise conveying any interest in the commercial real estate and evidenced by a written agreement signed by the owner or the owner's agent; and

(2) The real estate broker and the real estate salespersons retained by the real estate broker have provided licensed services that resulted in the procuring of a person or entity ready, willing and able to purchase, lease or otherwise accept a conveyance of the commercial real estate or any interest in the commercial real estate as provided for in the terms of the written agreement signed by the owner or owner's agent or other terms which were otherwise acceptable to the owner or owner's agent as evidenced by a written agreement signed by the owner or the owner's agent.