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I don't have an answer for your first question but I believe for the 2nd, you need some kind of identifier that makes it unique. So you could even share a post office box number if you have a different "suite" number (even if it's made up).2. Would an address shared by many businesses be okay to build NAP citations?
yes. It will be ok as long as another business with a similar service type doesnt exist at that address, otherwise google often "filters" the weaker one out and only shows the strongest in the map pack2. Would an address shared by many businesses be okay to build NAP citations?