Victoria, robert is correct, as the amended law, for any Federal related loan (and that's just about anyone!) needs to give 90 days notice. However, we who do REO's offer quicker "Buy-out" programs for tenants to vacate the premises. Some cities, however have Just Cause eviction ordiiances.
They are: San Francisco, Oakland, Berkeley, Los Angeles, Santa Monica and West Hollywood. San Jose, Palm Springs, Hayward and Beverly Hills have rent control, but no eviction protections. San Diego, however, has "just cause" eviction, but no rent control. A few other communities have mediation programs or very limited rent control. Those won't help you in this situation, and your "protection" is limited to that provided by state and federal law.