Hmmm...is this quote directly from TelX or some other datacenter/tenant in that building?
Because even by NYC standards, that's a bit expensive ($900 + $100 per box). And I am assuming they are charging for each additional box because of power, so if you put a powerful blade server, technically one enclosure, would they provide all the power it needs for just $100?
Try
http://www.ftgx.com/ I am not 100% sure if they are carrier neutral but they do have level(3) in their BGP mix, so may be you can work out with them a deal for just level(3). The last time I asked them for a quote was a couple of months ago and I dont have the sales contact info of the person I talked to. But the quote was very reasonable for NYC.