Thanks to the 2009 federal legislation, most tenants with leases will keep their leases, and month-to-month tenants will have at least 90 days to relocate. Tenants with leases have no legal recourse against their former landlords, because they are in the same position vis a vis the new owner as they were with the old: The lease survives and ends as it would had there been no foreclosure. Similarly, month-to-month tenants always know that they can be terminated with proper notice, and 90 days is longer than any state’s termination period.
However, a lease-holding tenant whose rental has been bought by a buyer who wants to move in to the property ends up less fortunate than before the foreclosure — he may lose his lease with 90 days’ notice, a result that probably would not have happened had the owner simply sold the property to a buyer who intended to occupy the property. (Normally, the new owner has to wait until the lease ends, absent a lease clause providing for termination upon sale, though such clauses may not be legal in all situations.)