In those situations, the landlord’s interest in maintaining his property in a safe manner would outweigh the tenant’s interest in having the objectionable pet.
In New York, in buildings where pets are prohibited, a landlord and its employees and agents (including the superintendent, doorman, and managing agent) must be ever watchful to see if any resident has violated the ban. A landlord will be deemed to have waived it right to enforce a “no pet” rule if the tenant has kept a pet “openly” and “notoriously,” the landlord or his agent has known or should have known of the pet for three months or more, and the landlord does not begin a court case to enforce the no-pet clause within the three-month window.
In response to receiving a notice of default, a tenant may claim their dog as an ESA. A landlord should quickly determine if the documentation furnished is sufficient to support the claim, and, if not, ask the tenant to supply the required information. The doctor’s (or therapist’s or other clinician’s) letter must state how long the tenant has been a patient, the diagnosis, that the tenant’s disability limits a major life activity, and that the tenant needs an ESA in order to fully use and enjoy the apartment.