or modify an existing building for the Museum, which shall be located at the site selected by the Board of Regents under this subsection. (3) Nonapplicability of provisions relating to monuments, commemorative, and other works on the national mall Chapter 89 of title 40, United States Code, shall not apply with respect to the Museum. (b) Cost sharing The Board of Regents shall pay— (1) 50 percent of the costs of carrying out this section from Federal funds