Some areas have restrictions on mobile homes or rentals.Utilities: Ensure the land is equipped with essential utilities like water, sewer, and electricity.

In the Parlor floor we added a large-ish kitchen with electric oven and cooktop that goes to the sub-panel that belongs to the Parlor floor, making it a nice 800ft 1 bedroom apt, with access to a shared backyard.   

And there're restrictions on how you can use these accounts.

Something of this magnitude would normally have a newspaper article, or a publicly accessible court docket.

You may need an asset partner to help you with a few flips so you have full access to financing. 

Also double check on the ADU size restriction.

Also there is no restriction on acquiring conventional loan on primary residence even if you have maxed out on conventional loan for rentals.

You most likely would not get access to them until disposition of the entire property/partnership interest of not handled correctly.

I don't think its fair for you to say they are making money without it as I doubt you have access to their books. 

If you’re looking for multifamily deals in NC, try connecting with local commercial brokers who specialize in multifamily properties—they often have access to off-market deals.