A lease can be as simple or complex as it is needed. A simple contract completes the names of the parties, the date of the initial lease, the new rental dates and the signatures of both parties. This ensures that all the terms of the original lease, with the exception of the term of the lease, remain consistent. Landlord and tenant laws vary from state to state. But in most states, the lessor is required to comply with all the conditions indicated in the lease, which is coming to an end. In addition, most states require the landlord to address the tenant in advance in post-account rental situations before they can increase their rents. A lease renewal option means that the tenant has the option to continue renting the premises before the end of the rental period.