Regarding the primer I hope you are aware that in California that if the correct amount of the security deposit is Not returned to the tenant that they can sue the landlord for the return of the security deposit, all court costs and expenses, and the judge may award the tenant the remaining amount of the security Plus up to 2x twice the amount of the security deposit if the Judge determines you withheld the security deposit in "Bad Faith"http://www.courts.ca.gov/1049.htm

If this went to court, you don't have a signature on any agreement with them, so how can they even name you?

Because I'm trying to figure out if there is any other way besides going down to the court house to get the addresses to the estates?.

Their lawyer told us if we do not fulfill every single request of theirs they will take us to court and the lease (from realtor association web site) is invalid.

It's public record and I go once a week to the court house in the probate department and ask for the recent probate cases for the past seven days.

I practice in the federal courts (bankruptcy) and am not familiar with many of the local attorneys.

Bring them to small claims court over it???  

On the first Tuesday of each month, each county is allowed to hold a tax auction where you can purchase properties on the court house steps (not all of the 254 counties exercise their State given right). 

Is the property held in a trust or does the heir have court powers?  

We have had some issue with apartment complexes devaluing surrounding properties, but that was a result of complexes being built with the stated purpose of providing low-income housing.