(a)      (1)      It is unlawful for any person or other entity whose business includes engaging in residential real estate related transactions to discriminate against any person in making available a transaction, or in the terms or conditions of a transaction, because of race, color, religion, sex, disability, marital status, familial status, sexual orientation, or national origin.

            (2)      Nothing in paragraph (1) of this subsection prohibits a person engaged in the business of furnishing appraisals of real property to take into consideration factors other than race, color, religion, national origin, sex, disability, marital status, sexual orientation, or familial status.

      (b)      It is unlawful, because of race, color, religion, sex, disability, marital status, familial status, sexual orientation, or national origin, to deny a person access to or membership or participation in a multiple-listing service, real estate brokers' organization or other service, organization, or facility relating to the business of selling or renting dwellings, or to discriminate against a person in the terms or conditions of membership or participation.