D.C. Code § 10-115
Upon the dedication by the lawful owner or owners of the land contained in the parcel designated "C" and the transfer by plat as provided herein and/or the conveyance by deed of the land contained in the parcel designated "D," in accordance with map showing said parcels filed in the Office of the Surveyor of the District of Columbia, numbered as map 1817, the said parcel "C" to be dedicated to the District of Columbia for street purposes and the said parcel "D" transferred by plat and/or conveyed by deed to the United States, to be under the jurisdiction of the Director of the National Park Service, then the said Director, with the approval of the Secretary of the Interior, acting for and in behalf of the United States of America, is authorized and directed to transfer by plat as provided herein and/or convey by deed all the land comprised in the parcel designated "E" as shown on said map filed in the Office of the Surveyor of the District of Columbia and numbered as map 1817, said transfer and/or conveyance to be made to the owner or owners making the transfer and/or conveyance of said parcel designated "D" to the United States, such transfers and/or deeds of conveyance to pass title in fee simple to the said land, and any and all of such transfers when duly executed and consummated shall constitute legal conveyances of the parcels herein described to the parties in interest; provided, however, that good and sufficient title, satisfactory to the Mayor of the District of Columbia and the Director of the National Park Service, shall be given with respect to the land contained in said parcels "C" and "D," respectively; and provided further, that upon the transfer by plat and/or the conveyance by deed of the said parcel designated "E," as provided herein, the land contained in said parcel shall be subject to assessment and taxation the same in all respects as other private property in the District of Columbia.
D.C. Code § 10-115