I'd says things like; "You are fixated on square footage determining if a house is comparable but you are comparing single story houses to my two story and single stories cost more to build and typically sell for more than two stories of equal square footage" and would get told "if you don't like it go to the review board".What's the bet that next year when we try to use comps from early 2019 when the market has been soft they won't accept them if the market has gotten stronger towards year end.

Here's an article where I compared both options:https://www.biggerpockets.com/blog/buy-rehab-turnk...There's no right or wrong answer, it's completely dependent on each investor what they want, their skills, etc.There's trade-offs for buying the turnkeys at retail price-- that isn't just for nothing.

@Tobie Palmer for residential properties (1-4 units) ARV will be calculated via comparables.

How does it compare to a traditional FHA203K loan?

Just this month we closed on a second comparable condo, with 20% down to avoid mortgage insurance.Here's my big question:Should we now pay our future savings toward paying down the remaining 80% asap, or should I continue on toward a third condo with another 20% down, immediately renting it out and covering the mortgage payment, so on so forth... 

The other risk is that if you come in and kick over the hornet's nest, one or more of the neighbors could go to land court and claim "adverse possession".NC might be different, but here in MA, if you use the property of another, "openly, continuously and notoriously" for a period of 20 years, you can file an action and potentially own that property.If you really want to remove that road, you need to block it off for at least a day to break the "continuously" element of the test.  

Since I paid cash initially, this cashout is very large compared to partial down-payment investments.

Lastly you can compare the condition.

Hi Everyone, Still new to Jacksonville area and have 2 properties I'm currently working on.  I see one block to the left prices are 100K lower then one block to the right.  Would like to work with a real estate agent ...

That could make a lot of sense economically compared to the cost of time and and effort to clean.