Yes, that sounds about right -- we pay about $4k for 1gig midtown-midtown

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.