You might find stakes or other identifying markers in the ground.

The study should identify the preparer and have reference to their credentials, expertise and experience.Detailed description of the methodologyHere is an article explaining the different methodologies utilized in a study.

Interior inspections can be performed to identify what work should be done prior to listing.

There is a ton to learn just reading through posts here and listening to the BP Podcasts.If you are really early on your journey and trying to identify what methods to use I recommend heading to the library and reading or at least skimming a few dozen of the recommended titles from the BP Podcasts.

My main question is, how do I identify the best NJ submarket to look for properties?

Including it must be considered a "like kind exchange" and that you must identify replacement property within 45 days, and you must close on that property within 180 days.As long as the exchange is done properly it can be deducted on your 2022 taxes even if the deal closes in 2023.

I'm concerned that the two professionals you hired to diagnose the problem couldn't immediately identify there was no gas service to the home. 

You've identified what you are good at AND enjoy (buying and selling) and that is HUGE! 

All you need do is to use drop down boxes to identify the items and call up the reports.If you are looking for individual rentals e.g. guest info etc., creating a spreadsheet will work along with the accounting system.  

Some turnkey companies sell the property to investors at the point where the rehab work is identified and quoted, but not yet completed.