The interest rate doesn't matter, as long as I'm getting at least $350-400...depending on how much (in dollars...not percentage) I put in as a Down Payment.

Believe the percentage is higher now, but the CC&R may not have to reflect that.

CMHA also requires the tenant's total monthly rental amount to fall within an acceptable percentage of their gross monthly earnings.

@Mike SolaIncome taxes by themselves usually won't flip ROI from negative to positive and vice-versa as tax liability is a percentage of taxable income and tax benefit is a percentage of tax loss. 

Since 2016, however, we've seen this jump to an annual growth percentage of 7.88%.

As long as she pays and the percentage/late fee is more than what you would have earned on the rent had you invested it for a couple of days extra each month, I would renew.

I'm not sure what your management team costs, from what I've seen most low rent places take a flat rate instead of a percentage. 

No, if your operation agreement states who owns what and in what percentage.

Many policies have penalties if you do not maintain a specified percentage of the RC (typically 80%).If you chose to insure at the Actual Cash Value (ACV) your limit will be less than the RC limit. 

In percentage terms thats 7%-12% roughly.