I think the new owners will have to follow the same billing practices as the former owner.
They will have to give proper notice that the billing procedure will be changing when each unit renews their lease.
You should take this to a local landlord tenant lawyer for a consultation.
If you are month to month the landlord can raise the rent for change fees WITH REASONABLE NOTICE. If you have a written lease still in effect, I would argue that those provisions control and cannot be changed until the lease expires. The reasonable notice if you are month to month? Usually that would be at least 15 days before the end of any monthly period. They cannot raise rents or fees RETROACTIVELY, but only for FUTURE periods of time.
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