That the tenants in a lease cannot be changed with out the signatures of all parties to the lease?
This is important when roommates rent together and one wants to move out before the other. Unless all roommates, any co-signers, and the landlord agree in writing otherwise, the tenant vacating remains responsible for all terms under the lease, including for rent and for any damage done to the property. The vacating tenant will remain responsible until either all of the original tenants vacate or a written amendment is signed by all. This is true even if the original agreement has expired and the tenancy has converted to month-to-month agreement.
That’s what it’s all a-bout!