An addendum is an additional document to the original lease.

I document it with some basic pictures to document the condition at that time.

Is this idea potentially feasible and beneficial?

I think if anything, what some others have noted above would be a bit more beneficial.. maybe notify them of a discount on that month's rent?

The document doesn't show a date that I can see.

@Arty Fresh I'm not a CPA so you would have to ask a professional for the details, but in general...you need to have documentation (paper trail) of every mile and how that mile applied to business use. 

My question is about income documentation for the cash out refi's that I will encounter, because I sure as heck won't do all this only to arrive there and discover that I was dreaming. 

If they provided all the financials, documents and reports you are requesting you can move pretty quick and get it done as long as the money will be ready.

There are probably some uptight agents out there that would hold you to that agreement but if not's not working out it's usually beneficial for both parties to go separate ways at that point anyway. 

You could later assign the beneficial interest to another party (the LLC).