How to Find the Current Note Owner?

[Geni P.]

I am trying to find the current note holder of an abandoned property in an effort to see who is keeping the mortgage current but not maintaining the property. Is there anyway to find this information out? The tax assessors have the mailing address listed as the property in question and the taxes are also current. One of the joint tenants is deceased and the other is the child of the deceased who I am having trouble locating. Skip tracing provides nothing, neighbors say they know nothing, even the private investigator is having trouble locating information on them. Running out of ideas... Possible rehab in the greater Los Angeles Area.