The reason they locate there (as with in London) if to reduce the latency for financial trading programs. It may not sound like a lot, but when you have an automatic trading application processing billions of trades a year it can make a huge difference to receive the information a little earlier, and place your orders that little bit quicker.

As a side note, Internap's LGA11 datecentre facility on 75 Broad Street is currently being evacuated, and most of the fuel reserves are submerged below water...