Final Sponsor Unit for sale. Unlimited subletting from day one. 6th Floor Walk Up Each unit at 342 West 21st Street features top of the line fixtures and finishes, state of the art design features and in-unit Bosch washer / dryer. Built in 1940, 342 West 21st Street is a 6 story, 31 unit walk up cooperative building located in the center of Chelsea. Re-imagined by Center Development, this is a rare offering of sponsor units that will not last long. 342 West 21st Street is in close proximity to the Highline, Chelsea Market, the art district major transportation lines such as the C,E,1, F and M subways as well as all of the best dining and nightlife NYC has to offer!