339.770.  Broker disclosure form for residential real estate transaction, provided by licensee, prior agreement, effect. — 1.  In a residential real estate transaction, at the earliest practicable opportunity during or following the first substantial contact by the designated broker or the affiliated licensees with a seller, landlord, buyer, or tenant who has not entered into a written agreement for services as described in subdivision (5) of section 339.710, the licensee shall provide that person with a written copy of the current broker disclosure form which has been prescribed by the commission.

  2.  When a seller, landlord, buyer, or tenant has already entered into a written agreement for services with a designated broker, no other licensee shall be required to make the disclosures required by this section.

  3.  Disclosures made in accordance with sections 339.710 to 339.860 shall be sufficient as a matter of law to disclose brokerage relationships to the public.