Since the bank now owns the home you no longer have any right of possession. The bank can immediately commence a holdover proceeding in landlord-tenant court (most likely Nassau District Court in Hempstead) against you to recover possession of the property. Once in landlord-tenant court, the proceeding can take anywhere from a couple of months to several months before a judgment and warrant of eviction are issued. You can possibly stay the proceeding by filing for bankruptcy, but that would have been a better option while the foreclosure action was pending and not necessarily now.
Tony L. D'Anzica, Esq.
The bank will often "buy" the house back at the upset price (the amount of their liens) because of the belief that at least they have their collateral - the money is already invested.