D.C. Code § 10-114

The Mayor of the District of Columbia is authorized to use for street and alley purposes the area comprised within the parcels designated “B,” as shown on map filed in the Office of the Surveyor of the District of Columbia and numbered as map 1817; and the Director of the National Park Service is authorized to make the necessary transfer of said land to the District of Columbia, same to be under the jurisdiction of the said Mayor for street and alley purposes.