We wanted additional units to pay mortgage and have cash flow.

THEY ARE NOT LIMITED TO ONE PROPERTY.So, they can 1031 to 2 or more additional properties OR 1031 into a rental property plus a DST so that all the profits are used up in the exchange. 

.- Value add - How much does it cost to build additional storage units?

There had been a recent addition of, call it, Landlord LLC.

Another option would be working with private lenders to see if they're open to your idea should you need additional funding. 

In addition to other tax strategies like a cost segregation study on the fully rented out house.

- Are there any resources / you tube vidoes/ or additional BP Videos I should be looking at- If anyone is so kind, would anyone be able to give me a tutoring lesson for any hour, and if so, I am willing to throw a little money for their time.

Here is a list of what adding ADUs in my CA market is typically a poor RE investment:1) The value added by the ADU addition is often significantly less than the cost of adding the ADU.

In addition to being illegal, if we had not caught this, (thanks Diogo!)

Pay attention to the duration.DM me if you want additional thoughts.Jeff