The author of Dirt Rich says he uses wegolook.com. 

Important to make sure everything is super clear regarding signature authority, consent requirements and everything is up to good standing with the local state

You can become an authorized user on the account of someone with excellent credit.

So even though property values may have skyrocketed, the taxing authorities aren't able to jump the taxes as much because of the limits the grandfathering puts in place.BUT... as soon as you buy a new home, or transfer it to a new entity (think LLC)... all that grandfathering goes away, and the taxing authority will bring  you up to that new Just Market Value".  

One partner was the author of the book and the other partner wrote the forward.

You might talk with a real estate/estate attorney and see if it's possible to open a probate, have a Personal Representative appointed and obtain an order from the court authorizing the sale of the property by the PR with the proceeds being deposited into the registry of the court for later distribution when all the heirs are identified. 

This is how the California Real Estate Commission gets involved in fractionalized mortgage note offerings in the state of California and gets it authority to require that anyone selling fractionalized interests in California be licensed as a California real estate broker. 4.

Based upon the tax certificate issued and relied upon at settlement, I would be requesting that the taxing authority abate the liens against the property and pursue the seller directly for the amounts now claimed to be owed.

In either case, The Person would now own 20% of the asset and the LLC would own 80%.I've had authorities (not the IRS - that's my last resort) tell me both.

I wish they would require proof of ownership/authority, and proof that the property is properly registered and authorized to operate as a short-term rental.