(I know it's kind of a general question but try and give examples of your own experience, it will help me modify it to my situation). 

So far only one tenet had to modify their rent, then I let them out of her lease.  

I have had to modify what I am willing to take in risks. 

We talk with them on the pre-screen using a modified brandonTurner-like form. 

A whole life policy is being modified to behave like a compounding savings account with a guaranteed death benefit. 

If you're referring to property in Fayetteville, I suggest starting with  Chapter 161 of the Fayetteville Code of Ordinances which describes the zoning classifications, many of which have been recently modified. 

I would not let anyone modify my property, I would do it myself before letting even a “pro.” do it for free.

., 30 year amortization with balloon payment in 5 years), in which case I just ignore the results after year 5.Of course, the spreadsheet could be modified to account for multiple loans, multiple amortization periods and different payoff periods...I just tried to keep it relatively simple and able to suit my typical needs.

Also, I'm curious to hear – how does renting to C class tenants modify (if at all) the criterion for accepting an applicant? 

Each Housing Authority may file an Administrative Plan up to 1 time per year to modify the Section 8 HUD guidelines.