Md. Code, Nat. Res. § 5-9D-04

(a) (1) Subject to paragraph (2) of this subsection, land acquired by a grant awarded under the Program may not be converted from outdoor public recreation or open space to any other use without the prior written approval of: (i) The Secretary; (ii) The Secretary of Budget and Management; and (iii) The Secretary of Planning. (2) A conversion of land under paragraph (1) of this subsection may be approved only after the grant recipient replaces the land being converted with land that has: (i) An area that is at least equivalent in size with the land being converted; (ii) A recreation or open space value equivalent with that of the land being converted; and (iii) An appraised value equivalent to or greater than that of the land being converted. (b) Land developed or improved by a grant awarded under the Program must be operated and maintained for public use by the grant recipient for at least 15 years from the project completion date.