Once you graduate away from cable, it's pretty cheap in a central business district or office park. I think we have 100meg circuits everywhere now.
Unless Charter owns the monopoly in your area.. $80/mo for 100/7 copper, or $450/mo for 100 symmetrical fiber.
There's no monopoly on commercial fiber in many places. Even at my home in a city, I could get commercial metro-ethernet service from 4-5 providers. You do have to pay for build-out costs.
When you're siting an office, it's definitely something to look at.
Outside of college I've never been in a building with that kind of bandwidth. At a tech company office, sure, but they don't need to outsource this kind of thing. Your average small to medium business in my hometown has 3Mbps at best.