I saw something on the tv a while back, can't remember where but this guy had a similar condition. He figured out in the long run it was better to install semi-decent computers inside and create a half decent office. He then rented out the computers and their space at a premium to professionals who needed a place to work for a few days(including travelling businessmen.
He ended up getting in freelancers, writers and artists who just needed an equipped office to sort out paperwork or just a change of scenery. He marketed it quite well as to attract the right people (ie. not gamers) and ended up making quite a bit of business. A few months later when they went to visit him he'd rented half the office out to a company who needed extra space for outside staff and the rest were all let out privately. He also installed a little coffee room with kitchen accessories.
It might be quite costly at the start but you could easily make a return quite quickly if the interest gathers quickly. My one concern would be that licensing various programs for the computers could be the most expensive part. You could start off small with a few computers each with single licenses on a few computer and when the money starts rolling in, expanding as you go along. Rather than (god forbid if it doesn't take off) ending up with a room full of unused, expensive software.
I think i have a thousand ideas for office spaces, thats just the best one that comes to mind.
Also, the local church in the city centre here rents out individual car park spaces on a monthly basis. If it has a decent sized car park you could make a bit of spending money that way.
