02-039-410 Me. Code R. § 3
A licensee may provide a free opinion of value to a buyer or seller when the licensee is soliciting the buyer or seller to provide brokerage services and before an agreement to provide any services has been reached or executed.
At any time after the solicitation to provide brokerage services, as described in Section 3(1) of this chapter, a transaction broker may not provide advice to either party regarding market value.
A licensee who provides comparable market data to a buyer or seller for the buyer or seller to determine market value or list price is performing a ministerial act as defined in 32 MRSA §13271(9).
A licensee who represents a buyer or seller client shall advise the client of any factors or conditions actually known by the licensee, or if acting in a reasonable manner, should have been known by the licensee, that may materially impact the client's interest as it pertains to the market value of real estate.
02-039 C.M.R. ch. 410, § 3