The binding legal principles established by the majority judgment are: (1) In eviction proceedings under ESTA, the cause of action is the termination of the lease/right of occupation and the consequent unlawful occupation, not the specific ground for termination. (2) A landowner who has properly pleaded the factual basis for termination of a lease (ownership, existence of lease, termination, failure to vacate) may rely on any available common law ground in support of the eviction claim, even if different from grounds initially stated, provided this does not constitute a new cause of action. (3) Reliance on the common law right to terminate a periodic lease by reasonable notice is not a new cause of action where the factual basis for termination has been pleaded; it is merely a legal argument in support of the relief sought. (4) A party who terminates an agreement on a wrong reason is not bound thereby and may rely on a justifiable reason for termination at trial. (5) Even where ESTA applies, landowners retain their common law rights to terminate periodic leases by reasonable notice, subject to compliance with ESTA's procedural and substantive requirements (particularly sections 8 and 9). (6) Under section 8(1) of ESTA, termination of an occupier's right of residence must be: (a) on a lawful ground; and (b) just and equitable having regard to all relevant factors, particularly those enumerated in section 8(1)(a)-(e). (7) A notice of termination need not be in writing under ESTA, but the termination must be communicated to the occupier. (8) Where a lessee fails to pay rent or tender payment over an extended period after an initial refused tender, this constitutes relevant conduct under section 8(1)(b) in assessing whether termination is just and equitable. (9) A return of service by a sheriff or deputy sheriff constitutes prima facie proof of service, which can be rebutted, but where the return is not properly disputed the court may rely on it.