As I live next to these tenants I wanted to them to feel like they had control over this cost as it was variable and depends on their usage not a fixed rate I choose.

Who cares how many years one has in their craft, if no other variables are considered. 30 years buying ten properties total, is not as valuable to me as ten years buying 100 properties.30 years into my investing career, I hope to have had more than enough cash flow to do whatever I wanted in life for many, many years.

It's probably the second most important variable in predicting how an account will perform, whether delinquent or current.We've learned this using statistical analysis on our data that is millions upon millions of observations large.

Could be 5, 7 or 10 year term with variable or fixed rate & 20 year amortization/balloon.

I could use variables to make everything look good or variables to make everything look really bad so I am trying to take some of the variables out of it with what I posted.What I have in the example does not take into consideration the time value of money, but it does not make the deal look any better.  

I know there are a lot of variables (bedrooms, sq feet, quality, etc.), so anything within a +/- $300 range would be good.

Is it fixed or variable

(keep in mind you or your LLC are not able to do the physical work on the property)Those are the most common ways, but each situation has different variables.

Your main two options are a1) Home Equity Line of Credit - HELOC - 1 variable rate 2nd mortgage on your home.  

@Kelly Stanton I wouldn't use a HELOC as a down payment because it's variable rate debt.