Beginning this month, the U.S. government can now block foreigners from taking possession of real estate anywhere in the country when it concludes the deal may threaten U.S. national security. In the past, only foreign investment in U.S. businesses required the parties to consider the risk that the government would object on national security grounds. Now parties entering into a broad array of real estate deals with foreigners affecting land in particular parts of the country will also have to consider these risks, even if they do not involve any investment in a U.S. business.