Talk to a local realtor to ask about after reno estimate on the place, but just because you put in $160K in renos, doesn't mean the place is worth an extra $160K.  

-and - no one is going to take any responsibility if any of the numbers are off. if the ARV is off - that's on you. if your estimate for the rehab is off - that's on you. if it takes 6 months to rent once you're done - that's on you.hope this helps

We are actually having one our premier events in October called Junkers to Jewels, a 3 day in person classrom and bus tour to learn about flipping, rehabbing, estimating etc on actual deals with local investors. 

What she will have to give up though is a LESSER Sales Price that will have to be accepted for the home sale Vs getting TOP DOLLAR estimated to be $2M to $2.2M + .She will have to ACCEPT LESS since the Investor BUYING the home and agreeing to lease it back will have her locked in for the next 3 years.

What is the best way that me as a potential customer can prepare as much as possible to get the most accurate estimate from a general contractor before talking to any of them?

Still not going anywhere yet, not even an estimated number.

I estimate my equity increase was between $30k-$50k immediately based on similar comps. 

I look at actual rental comps, and not some estimate from Zillow or Rentometer.

There also many unknowns like the actual inflation rate, an estimate is necessary. 

Also estimated rent?