I am a Canadian that has been looking at doing BRRRR in the USA, specifically in the Augusta area.I have a realtor, property manager, and rehab contractor in place.What I am struggling with is the foreign aspect for me.

I am having a hard time narrowing down a location to invest and would like to better understand what specific things i need to look for and know in order to understand if an area is a good investment.  

However, an essential exception emerged in the 1990s, allowing specific rental income to be categorized as non-passive.

There are a lot of full-blown property management software systems out there with accounting modals (Builduim, Doorloop, Rentred, to name a few) but they do a lot of other things besides accounting, bookkeeping, and taxes so not the same thing as QBO.QBO has a few cheaper competitors Stessa & Digb.com that are specifically set up out of the box for real estate investors (e.g. income/expenses categories are things you'd recognize like repairs, appraisal, etc.) and there is no need to set up a separate class for each of your properties since the portfolio already includes these.

It gives a bad name to not just wholesalers, but their specific businesses in general.

Are there any specific considerations related to barns, pastures, or riding arenas that we should keep in mind?

You will generally find that almost everywhere, including unincorporated counties that house urban cities, rooming houses or border loging is specifically prohibited OR includes specific permit regulations like obtaining a Conditional Use Permit.

I do realize that is not a common view, but it's simply food for thought. 

While we don't do remodel work (e.g. garage conversions), I've heard from contractors who do that the typical range for all-in costs is ~$100-120K.2) ADUs are not as wild west: in the early years, we saw inconsistent application of requirements for things like upsizing water meters & lines, soils reports, surveys, electrical panels, stormwater management (all depending on property specifics & jurisdiction).

There just might not be enough inventory in the area that they are looking at specifically.