This adds up to $1,200 a year for a 6% annual return.A couple months ago I realized I had to sell the property for health reasons. 

That is very, very low if your tenants are injured and they are holding you responsible for their health costs.Minimum of $1M for liability, $2M if you can afford the cost.

Where there is some additional questions are whether items like health insurance for myself and my wife (the premiums not the actual medical expenses) would be considered part of this overhead (in the past we HAVE NOT put this into the "cost allocated" calculations for Sch E but instead listed them in Sch A.

Made low 7 figures over the years in profits pushing various health products on Facebook Ads, Google Adwords etc. as an affiliate.

A friend of mine was between jobs and had no health insurance. 

The stock market plays a role, in that it is people's perception of the health of the economy and some people will use stock market profits to fund a real estate purchase.

If he seems desperate and also on medication due to pain, you may run into scheduling issues in the future based on his health.

She's been dealing with various health issues that have made paying rent on time a problem.

There are two exceptions: Nonqualified use does not include any period of such use that occurs :(1) any time during the five-year period ending on the date of sale that occurs after the last day of use as a principal residence, or [ Meaning, of last  5 years, if you  rented a property of last 3 years does not trigger non qualified use, but in the last 5 years, if you first rent for 3 years and then move in for two years as a primary residence, 2/ 5 years is non qualified.](2) any time (up to two years) that the taxpayer is temporarily absent due to change in place of employment, health, or unforeseen circumstances. 

I am already aware of the city's health department requirements of property registration.