Answer:
It is an optional field, and you won't get CTRs back just because you left it out. However, we are told that eventually FinCEN may allow you to use the individual branch RSSD number in lieu of filling out the branch's address information. So on a going-forward basis, I suggest you identify the RSSD numbers for each of your branch offices, and start using them in your filings.
If you have branches to which an RSSD number has not been assigned, you can leave the field blank.
First published on BankersOnline.com 4/15/13