Which type of lease does not have a fixed end date?

A month-to-month lease is a rental agreement that can be terminated by either the landlord or the tenant with proper notice, typically ranging from 30 days to one full rental period. This type of lease operates without a fixed end date, allowing the tenant to reside in the property for as long as desired, provided notice is given when either party wishes to end the tenancy.

This flexibility distinguishes a month-to-month lease from fixed-term leases, which have a specific duration agreed upon at the start and end of the lease period. Commercial leases can also have fixed terms, depending on the contract. A tenancy at will, although it also lacks a fixed end date, is usually less formal and not as commonly utilized in residential situations. Thus, the defining characteristic of a month-to-month lease is its ongoing nature until one party decides to conclude the agreement, making it the correct answer for this question.