Which of the following statements is true about a legal lease?

A legal lease must include a base rent amount because specifying the rent is a fundamental aspect of the contractual agreement between the landlord and tenant. The base rent amount establishes clear terms for the financial obligations of the tenant and provides the landlord with an expectation of the rental income. This requirement ensures that both parties have a mutual understanding of the financial commitment being made, which is critical for legal enforceability.

While other aspects such as written or oral agreements, the number of signatures, and the duration of the lease can influence the lease's nature or enforceability, they are not universally required characteristics of a legal lease. For instance, a lease can legally exist without being formalized in writing under certain conditions, and its duration may vary. However, without a clarified base rent, the lease lacks a key element that defines relationships and obligations between the parties. Thus, the inclusion of a base rent amount is essential for making a lease legally binding.