Md. Code, Land Use § 20–302

(a) The Commission has exclusive jurisdiction over mandatory referrals made under this part from the United States or the State, or any unit of the United States or the State.

(b) A county planning board has exclusive jurisdiction over a mandatory referral under this part by the county planning board’s respective county government or any unit of the county government.

(c) The Montgomery County Planning Board has exclusive jurisdiction over a mandatory referral under this part by the county board of education, a municipal corporation or special taxing district, or a publicly owned or privately owned public utility.