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Unless the tenant lives in subsidized housing or in a local jurisdiction that has rent control, a landlord can raise rent on any tenant except if it violates a lease agreement.
When a property changes hands from one owner to another, the new owner gains only those rights that the prior owner had. If the prior owner was bound by a lease contract, the new owner would be bound as well. (Note: if the new owner is actually going to move into the property and live there, the laws are different.)
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