Dear Tenant,
Your rent will increase from $XXX a month to $YYYY a month, beginning with your January, 2008 rent.
If you have any questions or concerns, please call VVV-VVVV.
Sincerely,
Landlord
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Send certified or with some kind of tracking so they can't say "I didn't get it."
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Rent Increases
A rental increase may be any amount the landlord wishes to charge. Rent for a Tenant with a Lease can be increased only when the lease term expires. Tenants at Will may face a rent increase at any time, as long as notice is received at least one full rental period, but not less than 30 days, before it becomes effective