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

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. 

These are professionals with additional training and a stricter code of ethics.

Quote from @Chris Seveney: Quote from @Devin James: In 2021, we saw buyers upgrading to larger homes, taking advantage of 3% interest rates to afford an extra 300+ square feet.Today, smaller homes are selling much faster as higher rates make additional square footage less affordable.While rates are historically average, I don’t see them dropping significantly.

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

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

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

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

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

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.