I would also I from them they can move out early, and give them formal notice as stated earlier.

My assumption would be that a US judicial system may not function for foreigners, and I'd be curious about some of the same questions for other countries and legal systems, too.

You get a judgment to avail yourself of judicial remedies for collecting (liens, garnishment, etc.)

Instead, it has to go through a judicial process.

That being said, if you think the upper floor tenants are indeed a problem, then issue them a formal notice to cure.  

You can follow all corporate formalities with religious fervor and still get stuck with a personal judgment on an alter ego theory (in many states).   

Like a mortgage, the land contract is a security device, but it lacks many of the formalities of the mortgage law.

I believe the formal name is an enhanced life estate deed which as Tom Gimer already pointed out does not pass title until the Grantor dies. 

Also,  below I have some basic questions:-Process or possible Roadmap -Get loan pre-approval letter-Issue formal offer-Get offer accepted - go to contract with a 35 day term-Property inspection ---Key areas: building with solid ductwork, plumbing, structural, electrical, etc.

Keep in mind that an LLC (when set up properly and all the corporate formalities/documenting are followed) acts as a lead bubble around a particular business endeavor...meaning anything that blows up within that business, the damage is contained to that business alone...and any liabilities that occur outside of that business doesn't penetrate through to affect that business.