Except with respect to that part of the National Capital Service Area comprising the United States Capitol Buildings and Grounds as defined and described in sections 5101 and 5102 of this title, the Supreme Court Building and grounds as described in
section 6101 of this title, and the Library of Congress buildings and grounds as defined in
[section 11 of the Act of August 4, 1950] (
2 U.S.C. 167j), the Director shall ensure that there is provided in the remainder of the area described in
section 8501(a) of this title adequate police protection and maintenance of streets and highways.