sometimes the tenants themselves cause a lot of problems with their landlords. a lease proposal is a contract between a landlord and a tenant. a lease proposal letter is the link between the landlord and the tenant. a lease allows a tenant to occupy and use a space for a specific period of time. a tenant should always read carefully what is written in the agreement before signing it. a lease contains the duration a tenant is allowed to rent a house or a property. a lease sets out the obligations of the tenant and the landlord. it sets a rent amount for the whole duration of a lease.