Md. Code, Local Government § 4–509

(a) Unless the zoning classification is amended under the procedures

required by the county, for 5 years after the effective date of the unified charter, the

land of a merging municipality that does not have planning and zoning powers may

not be placed in a zoning classification that allows a land use substantially different

from the use allowed by the master plan or plan of the county or agency that has

planning and zoning jurisdiction over the land before the merger.

(b) This subtitle does not grant planning and zoning powers to a unified

municipality if none of the merging municipalities has planning and zoning powers.