There may be three ways to buy coops: one from the coop itself because it go foreclosed;through a bank foreclosure or through a normal seller. You need to get a buyers agent that understands this market. In new York there should be a number of them. Things to consider when buying a coop is the percentage of rented units because that may affect the ability to get a loan and may affect your value in the future. Coops also have projects that are loanable and those that the buyer needs to pay cash. Get an expert to help you make the right choice.