Maryland Business Occupations and Professions Section 17-607
§ 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.