I see you're in Manhattan and if you're willing to pay up to $200-$800/month (enterprise class with SLA) you can get dedicated IP-transit of 100M/1Gbps+. This is NOT consumer/small business internet. This is 100% dedicated bandwidth. It may require a BGP-capable router with a network engineer handy if you don't have the experience or get the Tier-1 ISP upstream provider to service it for you. If it's a High-rise most-likely VZ/Cogentco/XO and a few other Tier-1 and upstream providers probably already have GigE/OC-X fiber termination router in the basement and it doesn't cost them much to hook it up. There are a few carrier hotels with Internet exchanges there (Equinix, 111 8th street, a few others, I frogot.) If this is for a business. Check with your high-rise mgmt. and see what carriers have fiber in the basement. Every single high-rise these days has a fiber-termination gear of GigE/10GigE/OC-X in Manhattan due to business needs of certain firms in certain buildings. Bandwidth is available in NYC at reasonable costs, you need to go engineering mode and not buy consumer internet and go dedicated. The costs have dropped dramatically.
Your in Silicon Alley in Manhattan and are on 2xT1? WTF? Screw Time Warner, their crap is HFC anyways. Go buy real fiber dedicated IP-transit for your company for usually $1k/month all costs included in Manhattan. There are some big financial/media firms using a shit-load of bandwidth so the costs go down for small businesses. You need to go buy real internet and talk to a network engineer.