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 add your Suite number to your surname field. Your address will end up looking like this:
John Doe #1234
24B Moorefield Road
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 just for a short while.