New Zealand Law
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Normally when you have a change of landlord, the lease carries over on the same terms as before. If you have had an arbitration about the rental, this carries on and the new owners are bound by the result. The agreements about the lease would need to be placed in writing however and any conversation which has been recorded would not provide evidence of a contract. It is not illegal to record the conversation, but if it was made without your consent, they may have some difficulty in using this if it was obtained unfairly. So the arbitration result is what will be important, if you cannot agree with the new owner about the rental.
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