That's the job of the QI - to guide you through.

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If property taxes are not paid services will go away, creating extreme poverty, and let's look at Flint Michigan the city lost residents who paid for services and local taxes its a downward spiral.

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They also have many forms available for download on their website for members (lease addendum, 5-Day Notice, and much more) as well as resources (such as an eviction guide which has a timeline based on the local courts and laws).Finally, my Apartment Association charges $13 for tenant criminal/credit background checks which is pretty cheap, IMO. 

The resulting cash flow is the number you're looking for for comparison.Now take the sold comps in that same area and sq ftg, and use that as your guide for the monthly payments. 

They can publish a 100 page cleaning guide if you want to, but nobody is going to change their cleaning practices.

If you can do both, and the tenant has income over the poverty level, you MAY be able to garnish wages or otherwise attach their income.

The metrics thrown around here and other places should guide you but aren't hard rules.