«“The termination of a tenancy agreement (whether residential or non-residential) by the landlord may only be carried out on the grounds of a breach of the agreement by the tenant, that is, a violation of legal or contractual obligations by the tenant,” begins Regina Santos Pereira, Partner at SRS Legal. This rule applies to all tenants and all types of tenancy agreements, regardless of the tenant’s age or disability, or the date on which the agreement was entered into, meaning that it also applies to older agreements.
[...]
However, the concept of “termination” on these grounds “is distinct from termination by notice or the landlord’s refusal to renew the agreement, which may be carried out in accordance with the law but are not based on a breach of legal or contractual obligations by the tenant,” Regina Santos Pereira points out.»