@Russell Brazil thank you, is there specific language in an escalation clause that would hold the seller’s agent accountable to provide any countering offers? 

It is possible to do a lease that has language that you and the owner will attempt to complete a short sale (will need a realtor involved) at a specified price and that if it is not successful by a certain date then you can get out of your lease. 

I am heavily leading toward prorating just the one day accompanied by a written explanation of the prorated day including “living condition language”.

Can you intelligently speak their language, whatever it is Java or C++?!

Your addendum will cover all your bases however the fact still remains that the RTA trumps any lease language/attachments in contravention of the act. 

However, even if it addresses it and says something along the lines of, “tenant is responsible for repair to HVAC under any circumstance,” does not mean that the language in the agreement is legal under PA law (just because something is in a contract - and agreed to in writing - does not always mean that it is legal if local laws may exist that specifically say that it is not legal.)

Will there be language that the buyers are purchasing the home "as is"? 

If you are a guarantor on the loan, even if the loan is to the LLC, usually, language in the note says something like they MAY report your performance to the bureaus.

.#2 Title companies will accept a cashiers check, but will fight you on it, using language like "we can't".

Sometimes Sellers frown upon that language as smart sellers are wise to avoid contract flippers.