Gary supposedly has an office leased from the same company that provides the answering service. It's an office space and services for rent company that offers anything from offices with full use of secretarial services and conference rooms down to just mail services or any combination. For instance, a company could have their mail sent there and pay for the answering service too and nobody would be the wiser.
By the way, I've been to that office for INOL and I also went to the pharmaCon office when Gary was the CEO of that "company."