When you are setting up address verification with Real Me you can use your Private Box address. If you are using a numbered account (like Suite 1234) then you need to try to add your Suite number to your address.
We have a helpful guide which suggests options for the formatting of your address with your suite number here.
Please note: Your Private Box address is a mailing address only. It is not your Residential Address. Your residential address is where you actually reside! Even if it is just for a short while.