Federal Restricted Buildings and Grounds Improvement Act of 2011 [sic] - Amends the federal criminal code to revise the prohibition against entering restricted federal buildings or grounds to impose criminal penalties on anyone who knowingly enters any restricted building or grounds without lawful authority. Defines "restricted buildings or grounds" as a posted, cordoned off, or otherwise restricted area of: (1) the White House or its grounds or the Vice President's official residence or its grounds, (2) a building or grounds where the President or other person protected by the Secret Service is or will be temporarily visiting, or (3) a building or grounds so restricted due to a special event of national significance.