Anecdotal evidence, but I have one tenant set up this way and it has been a good improvement.It was actually at her request about 2 years ago. 

While helpful as evidence of value, An appraiser will carry the most weight.

I make no judgement on the kind of business you may be running but if you raised rents from a 2003 or 2006 level to a 2020 level at one shot it’s pretty much self evident.

I hope you took pictures of the birds for evidence. 

That doesn't mean text messages can't be used as evidence in court.

Keep the returned envelope UNOPENED as evidence!  

That is evidence of the meeting of the minds.

. :)however, if found that 1500+ could be connected to him in recent dealings and after sampled deals review, i'd give more confidence points in the subject2 & wrap strategy just by sheer evidence - at least in the context of his/your local market in which you'd be operating in.at any rate, sounds like you have a nice path to mentorship and re investing opportunity.much luck to you and your adventures in RE!

Such pricing externalities are often conjectured in the context of the effects of expanded subprime borrowing on housing prices leading up to the financial crisis, and our study can be seen as complementary evidence in the student loan market." 

Though it shows the agreed upon terms which seems to make it more"evidence of the agreement," than a legally binding contract.