Rule 4531. Affidavit of service or posting notice by person\nunavailable at trial. An affidavit by a person who served, posted or\naffixed a notice, showing such service, posting or affixing is prima\nfacie evidence of the service, posting or affixing if the affiant is\ndead, mentally ill or cannot be compelled with due diligence to attend\nat the trial.\n
Affidavit of service or posting notice by person unavailable at trial
N.Y. Civil Practice Law & Rules Law § 4531, under Evidence.
N.Y. Civil Practice Law & Rules Law § 4531