Her accountant or the accountant for the executor should be able to provide accurate basis numbers.

It’s till a good market to get started in.Are you looking to invest in rental houses, or do you want to gamble on fix and flips?

Your accounting software is where you want to accurately calculate your Profit and Loss as this is what you will use to prepare your taxes with.Your analysis spreadsheets is where you will calculation your Cash Flow, ROI, IRR, Cash on Cash or any other ratios that are important to you.  

I definitely want my numbers and metrics to always be as accurate as possible and couldn't care less about something like bragging rights.

Not sure how accurate they are, but it's probably better than nothing. 

Minus $30k gives me a rough starting point of $57,500, subject to more accurate rehab estimates

If you want the basic no-overlays Fannie/Freddie LTV caps, meaning the best you can find that'll be a good 30YF at an attractive rate...I think Freddie Mac 2nd home LTV might be out of date, rest should be accurate as of this date. 

By Day 40, had anyone called the tenant's place of work supposedly inquiring about collecting on the tenant's outsized gambling debts?

How can i analyze a deal fast and accurately before i submit an offer?

Most of what you said for columbus is accurate I would say, but if you talk to several managers you can get a lot more info.