Except to the extent specifically provided by this section, this section does not
(A) apply to the United States Capitol Buildings and Grounds as defined and described in sections
5101 and
5102 of this title, any other buildings and grounds under the care of the Architect of the Capitol, 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); and
(B) repeal, amend, alter, modify, or supersede
(i) chapter 51 of this title, section 9, 9A, 9B, 9C or 14 of the Act of July 31, 1946 (ch. 707, 60 Stat. 719, 720), any other general law of the United States, any law enacted by Congress and applicable exclusively to the District of Columbia, or any rule or regulation prescribed pursuant to any of those provisions, that was in effect on January 1, 1975, and that pertained to those buildings and grounds; or
(ii) any authority which existed on December 24, 1973, with respect to those buildings and grounds and was vested on January 1, 1975, in the Senate, the House of Representatives, Congress, any committee, commission, or board of the Senate, the House of Representatives, or Congress, the Architect of the Capitol or any other officer of the legislative branch, the Chief Justice of the United States, the Marshal of the Supreme Court, or the Librarian of Congress.