The EB-5 investor can apply fro U.S.citizenship five years after the investor obtains conditional permanent residency. The EB-5 investor will go through the same process as other residents applying for U.S.citizenship.
Permanent residency to citizenship will be the same process for all permanent residents. After 5 years of permanent residency, there will be forms to submit and supporting documentation to provide to USCIS. An interview will be scheduled to review your application and quiz you on U.S. history and government, and determine your understanding of the English language. In the meantime, pay your taxes, stay in the U.S. more than be outside of the U.S., and don't get in trouble with the law.