We think demand for Dallas apartments will continue, jobs and population growth have been there and are expected to be there in the future.  

If yes and yes, maybe you do that (if you're no longer in growth mode with your investment properties).What I absolutely would NOT do, is paydown the investment mortgages (and not have enough to pay them off), as this will not change your immediate cash flow and now your liquidity position is significantly lower, but your risk in terms of monthly debt service on the properties stays the same.  

Highlights: Growing millennial demographic that prefers to rent, affordability, job growth.

The bottom of the kitchen sink cabinet was missing & had fungi growth that was never cleaned and replaced.

Also there is a ton of growth up north where we live.

Over the past 5 years, I have seen industry & population growth in Columbus explode, and effectively it has raised our housing prices.House hacking is a great way to get started!

The college is the big driver of the areas growth but I wonder what economic growth the city has seen, that would be my one hesitation for its long term growth, everywhere in CA is developing right now, how will this look in 4-5 years?

Debt on many vs a paid off few doors;  I summarize with;   you maximize wealth growth with more doors vs fewer...My view is that;  its very VERY hard to find good houses right now so I would always say; never sell a good house (ever). 

You’ll want to know if it is this a cash flow deal, a deal geared more towards growth, or a deal that has a healthy mix of both.

Congrats you are aware and growth is in your hands.