An oral agreement is the oral relationship between a landlord and tenant(s). Just because the agreement isn`t on paper doesn`t mean the lease becomes less restrictive. However, oral agreements can sometimes be the subject of misunderstandings that lead one to speak against the other. The maximum duration of an oral rental agreement is one year. To be evicted, your landlord must file an eviction action against you and have a legal ground. South Dakota defines legal ground as non-payment of rent and violation of the lease or lease. As a general rule, the lessor must terminate the lease in writing before marketing the tenant. .