Yes, EB-5 investors with pending I-829 Petitions may apply for U.S. citizenship if they meet all other naturalization requirements. The application for naturalization, however, will not be approved until the I-829 is approved. Applying for citizenship will force USCIS to adjudicate the I-829. It may be prudent to consult immigration counsel before proceeding since forcing USCIS to adjudicate the I-829 may, depending on the reasons for delay, result in denial.