The owner of the property that is in the foreclosure process is the legal owner until until such time as the actual foreclosure has been completed and a new owner is on record. Your existing month to month lease has to be honored by the new owner just as it has to be honored with the present owner. Your lease may continue in its present status except if the new owner wishes to take personal residency in your unit. In such a case you would have to look for a new place within the time frame of the mo to mo legal notice for the State of Florida or whatever is specified in your lease. In other words, you owe the rent money to the present owner until something different has been brought to your attention.