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.
D.C. Code § 10-901
Disposal of surplus real property: Section 2 of D.C. Law 8-96 provided that for the purposes of this act, the term "real property" means land titled in the name of the District of Columbia ("District") or in which the District has a controlling interest and includes all structures of a permanent character erected thereon or affixed thereto, any natural resources located thereon or thereunder, all riparian rights attached thereto, or any air space located above or below the property or any street or alley under the jurisdiction of the Mayor.
Mayor to establish centralized automated database containing inventory of real property owned by District: Section 4 of D.C. Law 8-96 provided that the Mayor shall establish a centralized automated database containing an inventory of all real property owned by the District, with the information to include certain data as specified in § 10-807.