And those are found of course by just looking at the non situs run on the county tax records.Also @Joel Owens  I don't see Joel driving around and looking to see if some 100 unit apartment he is brokering happens to be vacant...

Even using zip code will eliminate some records as the assessors tend to have a lot of parcel with incomplete, missing, or inaccurate property (situs) addresses.

You would typically need the APN to start your search and maybe the property situs address.

Does anyone have any feedback on Situs Real Estate operating out of Denver, Colorado?

I may have a filing obligation even where there is no income tax due.Each state is given pretty broad authority in establishing their jurisdiction (nexus is just the right/jurisdiction to deprive one of property essentially).So Ohio I know is complex because I had to prepare a couple.Basically for state income tax nexus is determined by situs of real property. 

In Cali, removing a MH from its original situs makes it very difficult to finance if it's on real property.

You may be able to get the assessors data and then use that to determine absentee owners by comparing mailing and situs addresses, but that is far more difficult and confusing than using Listsource. 

To keep us busy and out of the way while they chatted, they'd sit us on the kitchen floor and give us Campbell's soup cans to watch roll across the slanted floor LOL.

@Sean Cole - remember that there are two addresses to each record, especially for absentee owners, the situs address (the address of the property) and the mailing address (where the owner asked to have their tax bill sent).

If by chance, someone went after me... first, they'd never find me as owner and had to find the situs of the trust to even file a suit.