I agree with Nicholas, I think you can build a very basic query that collects info from submitters, and then returns results based on one data set, like geo.

you can download recent home sales using Redfin, for example : query 3/1 SF in three Detroit zip code.

Such as Excel Power Query, or an API?

For appealing appraisal, the easiest way is absurd adjustments (and adjustments are often absurd: $10k for a BR when simple query of average 2br vs 3br sold will show value of that extra BR on average, same for bathrooms, etc).  

There's a variety of ways to get a deal in front of you (I'm mostly a flipper), but basically if it looks promising, I run custom comps queries and check the current & past $/sf of renovated/distressed product in that city or zipcode.Here's a chart on 90066 I generated from my tool under Market Stats > Sales Data > Specific Zip Code:- My above chart (more available) shows the Avg Renovated $/sf (High) over time in this Zip Code, something completely different than charts/providers based on Averages/Medians only, like every other platform (RedFin Below, https://www.redfin.com/news/data-center/):- Can't select smaller locations such as City or Zipcode for their $/sf data, so it's useless helping me underwrite/verify a deal.- Can set Zip Code for Median Sale Price data, but again it's the median/avg so it's useless helping me underwrite/verify a deal.Then if that looks decent, I'll run Sales Comps, and get a quick summary of some key metrics based on those comps.

Take this 💥just-closed renovated property for example💥:With my query of "22757 Charlemont Pl, Woodland Hills, CA 91364 5/4/2400-3050,0.6,300" we get an ARV Estimate that is ~4% off, and I picked this at random just scrolling through recently closed in my areaAnd the Market Stats $/sf of renovated property in that Zip Code matches up pretty well, so I know the ARV estimate is realistic:You can also run Agent Stats to find/get in touch with the real top-agents in that area so you can triple-verify everything and/or list it with them when you are done.

Luckily by googling got this foram to ask question so posting my query.

Hey Andy - If you use the search function and query arbitrage you will see dozens if not hundreds of posts on this. 

I have confirmed using this lookup tool: (https://myhome.freddiemac.com/resources/loanlookup) that my property is owned by Freddie Mac (Results of query >> Yes.

If you could run some similar queries and post to show what AI is capable with the BP database of posts.