I have a physical address, used for shipping, receiving, and for customers to visit the business. But because the US POST OFFICE is adjacent to my location, in the same business property, the property owners dictated that I cannot put up a mailbox, since I can use a PO box at the POST OFFICE.
How can I add the PO Box as a mailing address, and keep the physical address too?
For your purposes I'd recommend using your PHYSICAL address for all things Google; if that mail ends up in your PO Box as a result of how the building routes w/ the post office, so be it. But it'll validate as your address, which IMO is the important part.