Maryland Code, Transportation § 5-704

(a) Except as to the land area subject to jurisdiction of the Board of Airport Zoning Appeals as established under Subtitle 5 of this title, a political subdivision or a joint board established under Subtitle 6 of this title may grant any variance to a rule or regulation adopted under this subtitle, if the variance will not endanger the public health, safety, and welfare.

(b) Unless the legislative body of the political subdivision or the joint board provides otherwise, any person who desires a maximum height variance may apply for the variance in accordance with the local procedure for requesting a variance to the comprehensive zoning regulations of the political subdivision.

(c) If an application for a variance is made, the political subdivision or joint board shall notify the Administration of the application at least 10 days before any hearing is held on it.