The USCIS is notoriously bad at providing easy to find and accurate information. In many instances even immigration lawyers don't have easy access to the information we need. One piece of information that has been well-hidden by the USCIS are the mailing addresses for Requests for Evidence or RFE's. If you receive an RFE from the National Benefits Center or NBC here's where to mail your response:
Overnight Courier (UPS and FedEx)
USCIS/NBC
Attn: RFE Response
850 NW Chipman Road, Ste 5000
Lee's Summit, MO 64063
Standard Mail
USCIS/NBC