Doing keyword searches on the popular sites with 'ADU' 'Granny Unit' 'DADU' etc and seeing what pops up and looking at the upside of those properties. 

But I am wondering if there is any good Keywords for Zillow, or any websites where something like this may stand out more or any tips someone may have for finding these type of properties in CO.Thanks!

Clearly you have your keyword alerts set up for my company anytime you see something potentially negative, even if it has nothing to do with you or the location you operate in, like this thread.

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Here is what Im doing hopefully it works for you Step 1: Set up keyword alerts on Zillow & Redfin for houses that meet your specific criteriaStep 2: Join FB Groups, off market listing sites scour them daily fro dealsStep 3: Look for signs of "stress" listings over 90 days old, keywords like motivated seller all might be a green light for negotiation.

Like I don't even know the keyword search to look for such people/firms.

Keyword is "opinion."

I also see every post on BP that references ADU (it is in my keywords).  

The key word is HOME.

Make sure to set up keyword alerts on your areas of interest and you can find local REIA listings here https://www.biggerpockets.com/rei/real-estate-club...