In summary actions for the recovery of premises, service of process shall be by ordinary mail and by delivery personally pursuant to R. 4:4-4. When the person serving process is unable to effectuate service by delivering process personally, service may be effectuated by affixing a copy of the summons and complaint on the door of the unit occupied by the defendant or, if that is not possible, on another conspicuous part of the subject premises. When the plaintiff-landlord has reason to believe that service may not be made at the subject premises, the landlord shall also request service at an address, by certified and regular mail addressed to the tenant, where the landlord believes that service will be effectuated. The landlord shall furnish to the clerk two additional copies of the summons and complaint for each defendant for this purpose.
N.j. Ct. R. 6:2-3