These web based businesses have very swanky addresses sometimes. It's called a virtual business address. All sorts of huge buildings offer this service to home based businesses for a monthly fee that is much less than actual office space rental. I have seen some for as little as $50 per month. They give you an address, collect mail and forward it to you.
Virtual business solutions is a good search term for this type of thing. Here is an example of what you can get:
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