Maryland Code, Land Use § 17-206

(1) may sell or otherwise dispose of any playground or recreational facility no longer needed for public use; and

(2) shall use the proceeds of the sale or disposition for the construction, acquisition, or improvement of any other playground or recreational facility in the metropolitan district.

(b)(1) Except for parkland acquired under an agreement with the National Capital Planning Commission, the Commission may exchange playground or recreational land held or acquired by the Commission in its own name or in the name of the State for any other land held or acquired by the United States, the State, or any other public body or agency, which the Commission determines to be more suitable for playground and recreational purposes.

(2) An exchange under this subsection: