
Quoting
Substituted Service
If the tenant is not at home or work when the server comes, the server can give the court papers to a competent member of the household where the tenant lives or to someone in charge where the tenant works. The server must also mail a copy of the Summons and Complaint to the tenant at the address where the papers were left.
The landlord cannot use this type of service until the server tries at least 2 or 3 times, on different days and different times of the day, to serve the tenant in person. This is called "due diligence." The server will have to fill out a form that says what days and times he or she tried to serve the tenant in person and that he or she exercised "due diligence."