Foreclosure/Rent question?

I rented a house that was sold in a foreclosure sale on 2/6/10.. my original lease agreement expired in january and the prior owner my lease was through did not charge me rent because of the foreclosure. the new owner who bought the house in the foreclosure sale wants me to pay rent to him and vacate the house in 90 days.. do I have to pay him rent, dont I have 90 days rent free to find a new place based on the 2009 tenant foreclosure act? or do I have to pay rent for those 90 days? please help..