Use the phone book, ask tenants in the building, and talk with neighbors of the property. One place to begin looking for the name of your landlord is the Tax Assessor's Office in your county. When calling or going into the office, give the physical address of the property and ask for the name and address of the taxpayer. Some landlords further hide themselves by only giving offices of public records a P.O. box for an address. With only a P.O. box it is hard to personally contact landlords to serve papers.
Landlords can refuse to pick up certified mail from the P.O. box.
If the tax assessor gives a P.O. box, ask what other properties the landlord owns. Often landlords may own several buildings and only one or two houses. A landlord is most likely to live in the most expensive home and rent out the other houses of lesser value. You may find an address of an expensive home, often on the waterfront or in the Eastside, owned by the landlord. More than likely, that home is the landlord's home.