Cited. 4 CA 162; Id., 627; 5 CA 101; 6 CA 373; 7 CA 301; Id., 639; 9 CA 477; 11 CA 360; 13 CA 150; 16 CA 574; 18 CA 384; 19 CA 483; Id., 564; 20 CA 159; 27 CA 530; 28 CA 684; 31 CA 575. The covenant of quiet enjoyment operates as a shield for the lessee in protecting his possessory interests in his leasehold; it does not serve as a sword of the landlord to terminate a lease agreement. 35 CA 185. Cited. 36 CA 432. Legislature did not intend to give an owner and lessor, but not a sublessor, an expeditious means of obtaining possession of the premises from a commercial tenant for nonpayment of rent; thus, plaintiff, as sublessor, could avail itself of section. 81 CA 486. Property owner may bring summary process action against one who has no right or privilege to occupy the premises without having to allege that the occupier is a tenant; furthermore, because statute requires party seeking summary process only to allege and prove ownership of the subject property and to assert a demand for possession, defendants could not prevail on their claim that plaintiff failed to prove that it was in possession of the premises or that it sought possession. 88 CA 661. Court order restoring tenant to possession in entry and detainer action did not create a new tenancy and plaintiff in summary process action was not required to serve a new notice to quit possession. 121 CA 790. The use of “or” indicates the disjunctive, therefore notice need not reflect both the owner's identity and the identity of the owner's legal representative, attorney-at-law or attorney-in-fact. 128 CA 805. Property manager's statements, including those of wanting to avoid court and attorneys and willingness to forgive 2-months unpaid rent, rendered previous unequivocal notice to quit equivocal, and was contrary to