So you cannot choose a person based on skin color, sex, ect.

You should evaluate all your applicants based on income and credit scores and apply this uniformly, regardless of race, religion, origin, familial status, disability, or sex of the applicant. 

Ironically, it actually discouraged me from building a permitted ADU and opting for a nonpermitted basement ADU for au-pair quarters and later on airbnb (STR not allowed for permitted ADUs/duplexes etc) which seems to be a better return on investment vs. long term renter if living close-in. 

AU laws are certainly much more stringent and regulated than the US. 

If you want to learn about a neighborhood, I would check crime maps and sex offender registries.

In addition to that, we like to check with the police, fire, insurance, sex offender status, and anything that might affect the operations of the park.

We will renovate it and turn it into student housing.  5-6 bedrooms.Single sex or co-ed? 

Unless there is no way to positively gear the property, then selling might be an option if you are moving, as any benefits of negative gearing here in AU (and I believe they are few and far between) would most likely not be applicable to US income if you moveCheersLindsay

For my tenant the foreclosing bank actually rented a 2 bedroom house to a registered child sex offender and his criminal unnamed 'friend' for $300 a month total and it included water, gas, electricity, sewer and trash!

Also consider paying for their move, for the cost of a U-Haul you can relieve a lot of animosity and make it less likely they will damage/ steal stuff on the way out.