* What types of evidence would we need?

This Wikipedia page gives different wall types and how well they block sound.  

Have you considered which markets or property types you're interested in? 

And the obvious, again well documented, FOR PROFIT.... 

This is the renovation criteria I use in order to make sure the place is clean, safe and actually ready to rent. https://docs.google.com/document/d/1MreMNvXxPZy7AaqMGMFPVunQ... 

It is used towards the appraisal, the environmental study, document review and preparation.

Hulk Hogan Gif's are Scientifically proven to increase the fun level of any type of forum.

Are you still looking for this type of deals?

What type of properties are you looking to acquire, SF, 2-4 MF, or 5+ MF?

I invest in Boise, ID and do quite a few BRRRRs, LTRs and STRs- varying degrees of success depending on how much equity we can force and the type of back end financing we can find, but the tax benefits are great and it's a rapidly growing market and Idaho is probably the most landlord friendly state in the nation.