D.C. Code § 10-116

The Surveyor of the District of Columbia is hereby authorized to prepare the necessary plat or plats showing the parcels of land to be transferred and dedicated in accordance with the provisions of §§ 10-113 to 10-116 , with certificates affixed thereon to be signed by the parties in interest making the necessary transfers and dedication, which plat or plats, after being signed by the various interested parties and officials, and approved by the Mayor of the District of Columbia, upon recommendation of the National Capital Planning Commission, shall be recorded upon order of said Mayor in the Office of the Surveyor of the District of Columbia, and said plat or plats and certificates when so recorded shall constitute a legal dedication and legal transfers of the property described for the purposes designated according to the provisions of §§ 10-113 to 10-116 .