I would say don't be afraid to utilize the equity line again.

Prepare for additional costs: If you’re adding units, you’ll likely need to address the water meter situation and possibly upgrade utilities.

STR management is 20-25% (I would recommend self managing or getting a VA), since income is higher you could probably get away with 5% for maintenance / cap ex but remember you need to cover utilities and cleaning for these units which drives up costs.

And have you thought about building back utilities?

Seeing as they have full utilities and stick built, they should be categorized as real property and have good value for their size.

Start with a standard offer, and write a contingency into it for electricity, all the below ground utilities, and then work your way to zoning, permitting etc.

Pick solid operators and solid asset classes.We syndicate self-storage projects.

The same was being said 15 years ago and we went from this huge shortage to being able to pick almost any home you wanted for 4 years and we were not building anything. 

However, if you've picked up on signs of potentially problematic behavior during your interactions, you might be able to highlight them by adding “good tenant conduct” to your list of standards. 

It SEEMS ( I of course don’t KNOW) that the subject of the threat was called out, didn’t want to admit the truth, and when the subject was pursued decided to pick up his marbles and go home in the way of 5 year olds.