When no specific ending date for a lease is defined, but there is an agreed-upon term, such as month-to-month for occupancy, this is known as periodic tenancy or estate from period to period. In real estate, this is one type of leasehold estate
The owner or landlord and tenant agree to certain rights and obligations for these periods, but do not specify an ending date, so it's an indefinite period of tenancy. Since no ending date is specified, notice per the agreement must be given for termination and vacancy.
Also Known As: Estate from period to period