DSL is impossible, T1 is expensive. Is there another option?
Evariste is right: call your local cable operator and see if they might be able to run a coax to your office and connect a cable modem. You might have to pay a one-time connection fee, but it shouldn’t run you anything like $400 per month for normal use. I have a business account with Comcast which gives me 8 megabit downlink, 768 kilobit uplink, a permanent IP, and permission to run a server, and it only costs me $100 per month. Home users (dynamic IP, no server) pay half that.
get cable, have it terminate outside the building, pay $50 to get a roll of coax that’ll go from the termination point to your window. B) get cable, pay the $3k for wiring the ENTIRE building. You save $300 per month, it pays for itself in 10 months. C) find out who really owns the DSL Copper. I thought Seattle was a verizon market (and I when I first got DSL here, I went through verizon, and they always referred to everything as “theirs”). After too many billing screw-ups, and horrible phone tech support, (and a move a short distance away), I switched to Speakeasy. Speakeasy is upfront and tells you nearly everything you could ever want to know about the service. Found out COVAD owns the copper here, though I can’t see what their prices are for T1, because I don’t have a phone number 🙁 D) Wireless/EVDO/Satellite services mentioned elsewhere.