To prohibit the expenditure of funds for the construction or lease of buildings or space in the District of Columbia for the United States Government until January 1, 2012.

Prohibits until January 1, 2012, the expenditure of funds for the construction or lease of buildings or space in the District of Columbia for any federal branch or entity within it, unless: (1) a contract for the construction or lease was entered into before the enactment of this Act; or (2) the interests of national security require the expenditure of funds for such purposes.