I am concerned with ultra low interest rates that our demand is not driven by healthy growth, i.e. economic and population, but rather on speculation and low interest rates making debt easier to manage.

Need to make sure the HOA finance is healthy not needing to raise dues.

There are plenty of pockets in DC where you can find good valued properties that will also drive healthy rents in the multifamily space.Another way to "house hack" in the district if the multifamily space is to expensive for you is to purchase a single family house or condo with multiple bedrooms and rent out the rooms to friends/like minded individuals that you wouldn't mind living with. 

Low cost of living, diversified sectors with rapid development, plenty of mfam properties, and healthy rent growth.

You have to find a balance between gowing healthy and growing fast.

And I have other, cash flowing properties, with debt on them, but I also have healthy reserves that continue to grow while I am adding to them on a regular basis, preparing to acquire more!

Despite that a construction to perm loan would be not much over $1,000 a month (with 2 Co-Founders with a credit score well above 750, and a healthy combined income) banks see it as "high risk" 5.

I have healthy cash reserves.6.

Your only location requirements/desires are as follows: Must have warm weather 9+/mo out of the yearMust have good - strong job market (UI Developer/Nurse)Must have relatively low cost of living (unlike the Bay Area)Should have healthy real estate market (rentals and flips)Here are your long-term objectives/goals: Purchase at least 10 acres of land to build a small house and start a small permaculture farm Become financially independent in 10 yearsEstablish the financial foundations for generational wealthGiven this financial standing, these location requirements/desires and these long-term objectives/goals, and a year to plan/move: Where do you move to and why?

Same to you, stay safe and healthy.