Md. Code, Business Occupations and Professions § 17–607

(a) Except as otherwise provided in subsection (b) of this section, in a real estate transaction involving a single-family dwelling, a real estate broker, an associate real estate broker, a real estate salesperson, or a lawyer acting as a real estate broker may not require a buyer, as a condition of settlement, to employ a particular:

(1) title insurance company;

(2) settlement company;

(3) escrow company;

(4) mortgage lender, or financial institution as defined in the Financial Institutions Article; or

(5) title lawyer.

(b) A seller may not be prohibited from offering owner financing as a condition of settlement.