The challenges stem from cautious equity investment and local opposition to these developments, which are believed to attract large families with school-age children.

The biggest issue with ADUs is small units in small count is very expensive development.  

Assuming you narrow it down to 2-3 areas I would then speak to several property management companies and/or investors to develop you 1-2 target markets.

Hi, I am attempting to develop something similar to this on an R-5 lot in Atlanta.

Once that deadline is broken, I do not give that same renter another chance.You need to really think this through, develop a policy, and run it by an attorney to ensure it is legal and makes sense.

National Park is the most visited park in all of the US. likely due to the large east coast population, but there's some knock-out views  for 500k  and a decent  2bed 2bath.  

I think the combination of fed cuts, insurance carriers slowly coming back, population/job growth being steady, future new supply dropping off, and a few other things bode well for rental properties in the coming years.

You might want to think about pulling up the carpet and taking a look. (2) Maybe the water delivery piping under the floor, hot or cold, has developed a pinhole leak and is spraying onto the subfloor from below. 

I myself am a value-add investor that likes projects other people either ignore or can't handle, but are too small for the developers.

Still close by but much more friendly tenant/landlord laws, property taxes are 4th lowest in the Nation, strong appreciation, job growth, population growth, etc.