Get an estimate for any major areas of concern. 

Of course, it has to be in your brand new-car, and you have to pay the gas and probably get this investor to lunch, after this you may have to write 30 offers,  all way below asking price, and if you are lucky enough, you put one under contract, then you have to go with your buyer to inspections and very likely you have to open the door to 2 or 3 contractors so they can start doing an estimate.

He had accumulated over a dozen single-family rentals and took me under his wing and taught me everything.

If there is only the original mortgage, you can run a mock amortization schedule to estimate where the owner is on the mortgage.   

Hey, Bigger pockets members I am in the columbus ohio market ,   i am an investor and looking to find  Good , Credible , reliable contractors for estimates. you can inbox me with this information or reply in post thanks.

So as per your estimates, what is the final cashflow per door?

But if I can only raise the rent by 4% (conservative estimate), then I'm just under the 1% rule.Right now, I'm learning towards doing the deal, as I'm sure I won't be using a property management company for a while (8% of estimates) and once I do, I probably will have been able to raise my rents to their full potential.  

So you just need to figure out the cost of doing so and add it to your renovation cost estimate.

Its a guess as to what an appraiser might find and that makes estimating a value a guessing game, too.

If so, there could be a conflict of interest with their advise.As for cost, around Ohio, the estimate is ~$1,500/year.