There may also be a surrender, either voluntary or by operation of law, which will determine a tenancy, as, for example, when a tenant is party to some act, the validity of which he is legally estopped from denying and which would not have been valid had the tenancy continued to exist.
On his side, again, the subtenant, by accepting that position, is estopped from denying that his lessor's title (whatever it be) is good.
The principle of all tenancies of this kind is that something has been done by the party estopped, amounting to an admission which he cannot be allowed to contradict.