While the landlord may choose to terminate your lease or increase your rent, state laws typically require 30 days or 60 days` notice before the tenant has to leave the premises. In most states, tenants who, beyond the end of a lease, remain in their rent without signing a new one are automatically converted to a monthly lease. As part of your rental agreement, you may be required to notify your landlord of your intention not to renew your rental agreement. However, this should be done in writing. While most homeowners are conscientious when maintaining and returning sureties, the letter should remind your landlord that you have been waiting for your surety. .