This NY Times article discusses how some prewar rental buildings are now being converted to condominiums. It’s a good article in that it explains some of the differences between condos and coops and points out some of the advantages and disadvantages of each. This trend is great for those who want prewar charm without the big-brotherish oversight of a coop.
http://www.nytimes.com/2010/07/11/realestate/11cov.html?pagewanted=2&_r=1