Maryland Code, Land Use § 3-206

(a)(1) When developing a municipal growth element of the comprehensive plan, a municipal corporation shall consult with the counties in which the municipal corporation is located.

(2) A municipal corporation shall provide a copy of a municipal growth element to the counties in which the municipal corporation is located before approval of the element.

(b)(1) The municipal corporation shall accept comments from the counties for 30 days after providing a copy of the municipal growth element to the counties in which the municipal corporation is located.

(2) Within 30 days following the close of the comment period under paragraph (1) of this subsection, the counties and the municipal corporation shall meet and confer regarding the municipal growth element.

(3) On request of either party, the county and the municipal corporation shall employ an appropriate mediation and conflict resolution service to facilitate the meeting and conferral under this subsection.

(c)(1) A municipal corporation and the counties in which the municipal corporation is located may enter into a joint planning agreement in order to coordinate implementation of a municipal growth element.

(2) A joint planning agreement shall consider the municipal growth element required under Subtitle 1 of this title.