here you go:https://www.redfin.com/IL/Bloomingdale/174-Merganser-Ln-6010...as you can see, it's the LOWEST priced land in this very established neighborhood!

There's a lot to unpack here... and it's not my goal to be a 'downer' on your aspiration... but just telling you my experiences to caution you about being new to the game...First - I don't think we know what state you live in, so just know that foreclosure auctions are handled very differently all across the country.  

I've always loved learning and there really is a whole lot to learn.

I aim to establish connections that can support my business needs effectively.Could anyone share their experiences or recommend strategies for connecting with reputable wholesalers in these areas?

There is a lot to learn, but you already have experienced the beauty of REI with your ADU.

Look at true, regional, drivable vacation markets instead with established STR presence 

@Will Barnard I have a lot to say but want to keep this respectful. 

That being said, it might cost you a little more than subbing each trade out but you're likely to make up for that cost on the sale and the time you save by working within established relationships.If there are any major issues with the project you're looking to take on you'll want to take pictures if you can so you can send them in advance so any contractors can bring the necessary tools to assess the scope of work.Take a quick look at the materials you're going to need for the site either on Home Depot or Lowes or something similar so that you know roughly what the cost of materials is going to be.

I forget the assembly bill that did not get passed that would in effect allowed each SFR lot to be like a R4 lot, allowing up to 4 units.  

Establish connections with other local experts, realtors, lenders, contractors, and investors to get knowledge from their experiences and cultivate a network.