We used to have (prob still do) palces here that had banks of desks, and all the normal office gear too. They were set up on the 'package' system for people needing office space for abit each week. Alot of traveling salesman used them and they had commercials on to the point of stupid on TV. Back then there were no laptops etc.
But I know some of them claimed to be all over the nation. Maybe one of the city offices could hook you up with where they might be if they still exist. Small business comission etc. They did the packages by what you needed as far as the equipment usages, hours in the office, phones costs (LD etc) and even had the ability to use a receptionist for taking calls while you were away. (If I remember right you could even pay for a private line that the recep would answer with your co name)
Might be worth checking into.
