Maryland Code, State Government § 20-707

(1) the making or purchasing of loans or providing other financial assistance:

(2) the selling, brokering, or appraising of residential real property.

(b)(1) A person whose business includes engaging in residential real estate-related transactions may not 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, gender identity, national origin, source of income, or military status.

(2) Paragraph (1) of this subsection does not prohibit a person engaged in the business of furnishing appraisals of real property from taking into consideration factors other than race, color, religion, sex, disability, marital status, familial status, sexual orientation, gender identity, national origin, source of income, or military status.

(1) 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

(2) discriminate against a person in the terms or conditions of membership or participation.