However GTT offered me 1gig from New York office to London Docklands for $2400! Under $2k for p2p to office in Washington DC.
If local internet is $500pcm , get two lines into the building for $1k/month, charge 50 people $30 a month and give them 1 gig and 25:1 contention ratio, plus the cost of dropping the fibre and a router, leaving $6k a year. It's not going to give you a full time job, but will give you some decent internet and a bit of pocket money to look after it.
Order an SDI video circuit from VZ to one of the interconnect buildings. That's $1.5K/mo but it is delivered as a point to point single mode fiber with VZ gear being plugged in. After they install it and leave unplug VZ gear. Plug in your 10G. You just got yourself a 10G transport for $1.5K/mo.
But in general, go to a decent building and order Cogent. That gets your building on the net. Cogent eats fiber extension charges left and right. Plus you actually get 1Gbit/sec for $500/mo. Now you take that 1Gbit/sec and wire to neighboring buildings by running ethernet or standard yellow fiber. That's how ghetto ISPs get stuff done. It was done for years because it works. There's incentive for those who own building to form a community ISP or provide an access to a community ISP because those that own builds want the same product and they know they can share some of the costs.