What is your location and what are you doing that he should be doing?   

Also, not looking for feedback about the value/necessity/negatives/ or need of doing a study.

Don't know enough to price/comp it out.

This but taking it a step extra: If you own a business in an S corp, having a C corp as a management company to do solo 401k and hold cash for any retained earnings needs can be a perfect addition to those who have SBA debt and want to pay it off quickly.

It would be a straightforward transaction, I wouldn't be asking for any concessions or doing any major negotiating. 

@Christian Beyer what PM company do you use?

Just include it in the rent. 

DSCR Loans in second position is not a thing - you might find a DSCR Lender that have other products that fit this need, like a Closed End Second or HELOC, but they aren't really "DSCR Loans" - I think you are likely looking for a CES (it is true however that you are correct in looking at the same place though, most of the lenders offering this on rentals are also DSCR Lenders)

I have partnered with a number of production builders that are starting to do what you mentioned.  

How do real estate investors handle the financial gaps when buying a new property before the previous one sells?