@Dave Fagundes : I agree with what Joe, Mark, and Matt have said.
@Joe Villeneuve , as he is wont to do, is starting with the end game in mind. This is a framework for the financials in terms of return. In assessing the deal you can arrive at your target return number and work backwards through the expenses. This reminds me of the "Profit First" model and strikes me as a quick way to weed out a deal as you get into it.
Agree with @Mark Sewell that historical financials may not always be the most reliable - especially if you only have 2-3 years out of an 80-year history. Combining this data with experience, whether yours or someone else's, sounds like a reasonable way forward there.
Finally, @Matt K. brings up a good point that all of this work done in the recent past could be things that you don't have to do going forward. This assumes that the work was done right and you will not be overpaying for it up front. If the numbers still jive at purchase, then I wouldn't mind paying someone for the good work they've done for my benefit.