Once you have removed the doubt of a previous owner wanting to get their property back by saying the county didn't handle things to the letter of the law, then you can get title insurance protecting your 100% ownership then sell like any other property.If you have a lot of old owners or bigger problems the the quit claim deeds from the people you can find will help speed up a Quiet Title Action.

How many people reside in a property and if they have pets.

I made my first offer on a house I can barely afford as a primary resident (3bd, 1.5ba close to Tufts University), I am glad the owners went with another offer, I would of paid close to 2.5k a month in "rent" for a single room assuming I rented out the other rooms at a near optimal price.

Also how would you create protection when purchasing in a depreciating market? 

It will also limit your access to financing and may increase some other administrative chores.Using LLC is an excellent tool for asset protection.

Can we get the advantages of house hacking while still holding the property in an LLC for asset protection?

His current residence was new build using VA, roughly 4 years ago.  

The tax protection and guaranteed return sounds like that it is a worthwhile option.

The reason is that my property with the mortgage is a rental property, not a primary residence.

Are you paying cash, you could use a land trust to protect you in Florida.