Md. Code, Business Occupations and Professions § 17–606

A real estate broker, an associate real estate broker, or a real estate salesperson may not post, on real property that is offered for sale or exchange, an outdoor sign or other advertisement on which the cost and capitalization of ground rent on the real property is shown in print or lettering that is smaller than the size of the print or lettering that is used to show the price of the real property.