Can a bank file an eviction on the renter of a forclosed property?

Just got a five day eviction notice served by Sac county sheriffs dept. In California. Thing is, I had an agreement with the bank that owns the property that I would continue to pay rent and when they want to sell the place they would give me a 90 day notice. This agreement was documented. The bank took ownership when the guy I was renting from(and paying rent to) let the property go into forclosure. The eviction notice says it was filed in march. I've been paying the bank since march. I've never been late. If they were taking my money, how can they legally hit me with this eviction!?