Great question — answering as the UphillTech team:
GMB makes it pretty clear, that you must use a valid address... since real businesses have registered addresses. You need to register the address with local authorities if it does not have a registered physical address. If you are location does not have anywhere for the post to be delivered too, i.e a field then you simply pay for a redirecting and forwarding service to another address. Forwarding your mail will obviously enable you to receive the GMB postcode that is needed to enable the listing. Another method that is a workaround but not approved by Google is to use the same address as the school i.e Unit 2 and change the marker, but you would need to inform the school to expect your...
Full answer by Simon Hayter: https://webmasters.stackexchange.com/a/109114 (CC BY-SA 3.0).
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