why on gods green earth would you want to buy 10k condemed houses :)  seems like a waste of time and money to me.

Non-passive to achieve this level of return.Add the addition of the ADU makes the main unit rent controlled if over 15 years old.the work to add an ADU likely exceeds the effort of a brrrr that can achieve infinite return  Experienced investors are adding multiple ADUs by leveraging items like bonus density, committing units to affordable housing, etc.  

Since you’re looking for a house hack, just plan on managing it yourself for now.

And IMHO, the prices are dropping big time (on avg. 10K/month...houses that were above 300K a year ago are not selling at 250K now) and the available rentals saturation is worse than I seen during summer season (with rents dropping from 1$-1.08/sqft to 0.8$/sqft and very little contacts and applications...just go in Zillow and look how many rentals are on the market now in Kyle, New Braunfels or Converse). 

I have five houses in Memphis area, and the biggest problem has been finding a good property management company. 

They are a corporate housing company.

When you say as long as its not directly in flight path, meaning - when plane flies over the house?

I have to clean your house?

After the new home is built, I plan to sell our primary house.

There’s a reason that big hedge funds still buy and hold houses.