On the first occasion, I leveraged it as an opportunity to move the tenants along, complete some rehab, rerent at market...

I will still be looking at leveraging wholesale strategy but also looking to incorporate other approaches as well.

If your goal is generating motivated seller leads, you need a holistic approach to SEO and to your brand overall. 

The real question is how many units are being built and what does net migration look like on top of demographics.I can answer the question for my market Milwaukee, because I have been tracking these metrics locally for the last 10 years or so.

But I started at a different time in the market cycle, and attribute my success to date to luck and caution, mostly to luck.

Spending some on marketing/mailers/trying to find motivated sellers would be a better use of your money (in my opinion).I downloaded one of his "free" blueprints to building wealth flipping vacant land.

Please let me know if I can bring any value to you about the markets I've referenced.

Assuming your market is similar, I would add an ADU not primarily as an investment.  

Approach some people you would love to add to your team and make them a better deal then they have now! 

The problem is you never know how long the time on market is for that rent or if they're actually going to get that rent it could just be the asking price and then they lower it or something over time.Good Luck!