Rey that logic doesnt wash > And it's common knowledge that oral agreements are generally unenforceable, even if they originated from an expired written contract, especially if it has expired for at least one year. . < how does one prove in a court that a oral agreement is valid , If you rent a apt from ME with no written lease but do pay a deposit to me and the monthly rent state law will define the minimal rental period between us for the purpose of notices to change something like LL telling u to get out or LL increasing your rent and the provable points of the oral agreement are based on these things> tenant has paid rent in the past , knew when to pay it , and to whom. then tenant cannot argue there is no agreement of any kind history does it. SO with a tenant who has a written lease every thing else but the length of it is still binding , if the original lease said NO pets that doesnt just magically vanish when the lease expires unless tenant ask in writting for consent to get a pet and LL grants it, if theres late fees due when rents are not paid , the ability to collect late fees doesnt just go away , when a lease has expired and many months later LL only wishes to raise rent proper written notice is all thats needed is that LL must give proper notice to raise it , if tenant doesnt like it tenant is free to give proper notice to move out. if the tenants expired now but written lease does not say how much notice is to be given to move out then state laws defined notice is what rules.