You consider the 3K+ BAH received from even just lower enlisted (with a base on each side of Oahu), foreign investors, government workers, shortage of non degree requiring jobs, etc.

Certainly the margins are decreasing due to both increased government regulation and market saturation.But professionals like Neil Collins here in Portland, who self-manage effectively, and can deal with government wonkage effectively still have profitable margins.  

If you have any federal loans put them on a 30 year payback and some of the private companies have a 20 year payback.

I was told that the state/government would be willing to pay market rent value for your property and in most cases it is more than what you would receive through a private or traditional tenant.

Brokerages have to issue margin calls (Federal Reserve rule) when the value of the stocks declines.

This is true for both Federal and State taxes.

Does anyone have a recommendation for private/government statistics which have rental vacancies rate broken down by county, town or even neighborhood?

That’s your number. https://www.grandrapidsmi.gov/Government/Departments/Office-of-the-City-Treasurer/Property-Tax-EstimatorInsurance: call an agent but typically $800-$1200 for SFH depending on price point. 

My other concern is that I don’t like tying up my money until almost age 60 & given the governments finances & what’s happening & about to happen to social security I don’t trust the Fed’s to even keep the Roth IRA benefits in tact to even the early adopters & others after it was promised too.

I called the city to explain (I also let my realtor know as a courtesy so she could let the buyers' realtor know).In extreme eyesore situations, government gets involved and code enforcement liens on the property can add up over time.