A letter to raise rent is a formal correspondence between an owner and a tenant. It serves as legal notification that the owner intends to increase the monthly rent of the property in question. This letter should include all relevant details such as the amount being requested, when the new rent will go into effect, and how much notice the tenant has before the change takes place. It also serves to record any agreements between both parties. Reasonable landlords are always willing to negotiate, so it’s important that tenants respond promptly with suggestions or alternate arrangements if they’re unhappy with the proposed increase.