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Notice Period: Most renewal clauses require the tenant to give written notice to the Landlord that they are exercising their right to the renewal option within a specified period of time, often 6 or 12 months prior to the expiration of the lease.
The answer to your question exists in your original lease. Typically the landlord is required to give you 30 days notice, much in the same way you are required to do the same for the landlord. Most leases include a clause that states this and also mentions that if a lease is not renewed the tenancy reverts to a month to month basis which means that anything can be changed from the original lease with 30 days notice.