D.C. Code § 10-901

Where 2 lots or parcels of land abut each other and 1 of such lots or parcels belongs to the District of Columbia, the Council of the District of Columbia, in accordance with § 10-801, is hereby authorized and empowered, when in its judgment and discretion it is for the best interest of the District of Columbia, to exchange such District-owned land, or part thereof, for the abutting lot or parcel of land, or part thereof.