office spaces
Private Suites
http://www.techspace.com/officespace/union_square (they also have one in Chelsea/Flatiron on 28th st) http://www.cityspacesuites.com/ -- 817 broadway http://wework.com/ -- space in Soho, Meatpacking and midtown. Meatpacking location is far west but has good bars/restaurants nearby and is on the L train. Also there are a lot of modeling agencies around there so it's full of hot babes http://www.selectofficesuites.com/floor-plans/broadway-at-25th-st--flatiron http://www.officelinks.com/ -- several locations
Coworking
http://dogpatchlabs.com/about/ - Dogpatch NYC. Excellent location, free, but loud and difficult to get work done. http://generalassemb.ly -- the "hot" spot in NYC right now, 20th and broadway. not a great place to work but great for networking. http://nwc.co/ -- New Work City, haven't been but it's sposed to be pretty good, hosts events etc
City-sponsored spaces (just for completeness, i guess)
http://www.nycedc.com/SupportingYourBusiness/AffordableWorkspace/160VarickStreetIncu bator/Pages/160VarickStreetIncubator.aspx http://www.nycedc.com/SupportingYourBusiness/AffordableWorkspace/Pages/AffordableRealEstate.aspx