I've started an LLC, maybe prematurely, thinking I'd be able to somehow keep a mortgaged rental in it to shield my personal assets.

As to your questions on my options for ending a lease early:  1) my lease's "one-money" buyout (#2) is a sum-certain amount which ends a lease prematurely. 

It is premature to know what will happen, because congress has to get support for an actual bill. 

This strains the compressor and can cause it to burn out or wear out premature.

The new refrigerant R410 when expose to air containing chemicals found in some typical household cleaners can cause the copper coils to fail prematurely.

I have seen this go wrong by others in the past when the other person dies, or tries to exit the deal prematurely, or doesn't pull their weight.

Sometime it is worth taking a little more time to find the right deal than jump into a bad one prematurely.  

It does not imply that today’s life expectancy is less than 50.It is way too premature to refer to rates over 6% being normal.  

This agreement shall automatically renew for successive terms of 1 year each unless either party gives the other party written notice of its desire to terminate this agreement at least 60 days prior to the conclusion of any such renewal term, in which case this agreement shall terminate at the conclusion of such term"If my uncle decides to terminate his PM because the current tenant is moving out prematurely, is this violation of the contract?

Is that enough to protect your family in the event of your premature death?