Reporting Requirements for Foreign Direct Investment In United States

"All investments in U.S. business enterprises in which a foreign person (in the broad legal sense, including a company) owns a ten-percent-or-more voting interest (or the equivalent) are subject to reporting. This includes foreign ownership of real estate, improved and unimproved, except residential real estate held exclusively for personal use and not for profit making purposes. Reporting to the Bureau of Economic Analysis (BEA) is required pursuant to the International Investment and Trade in Services Survey Act, as amended (citations and penalties are described on page 6 of this document)."

See here.