Most co-op boards I know of have rules that restrict sales to prospects at risk of bankruptcy. I suspect that this will not be a problem in high end co-ops and the few “shares” at risk will be bought by the shareholders as a whole rather than risk values of all apartments/shares.
The high end ones especially do. I’m thinking more of the middle/upper middle class buildings. Where between divorce and the downsizing the finance industry/pharma/etc have undergone over the past 5 or 6 years there is more of a risk. But especially the non co-op buildings. Can you imagine buying an apartment in a high end ‘public access’ building and finding out your new neighbors were section 8 types? I guess some DeBlasio voters will be figuring that particular scenario into their future.