40 U.S.C. § 8101 — Supervision of public buildings and grounds in District of Columbia not otherwise provided for by law

(a) In General .— Under regulations prescribed by the President, the Administrator of General Services must oversee the public buildings and grounds in the District of Columbia, except buildings and grounds that another law places under someone else’s responsibility. (b) Notice of Unlawful Occupancy .— If the Administrator, or the officer under the Administrator’s direction who is immediately responsible for those public buildings and grounds, decides that an individual is unlawfully occupying any part of that public land, the Administrator or officer in charge must notify the United States marshal for the District of Columbia in writing about the unlawful occupation. This section does not define the term “public land.” (c) Ejection of Trespasser .— The marshal must have the “trespasser” removed from the public land and must return possession of the land to the officer whom the law charges with custody of the land. This section does not define the terms “trespasser” or “officer charged by law with the custody of the land.”