Hood will not close, too big to do that but the troop strength stationed there varies wildly at times.  

I ask because, even when using market rates, the results I get from each model vary greatly.For instance, when modeling expenses as a percentage of the rental rate, if expenses are assumed to be 50% of rental income, I must have a rental rate of 1.0% of the purchase price to cashflow:However, if I model expenses as a percentage of the purchase price, even if expenses are assumed to be 1.6% of the purchase price, I only need a rental rate of 0.7% of the purchase price to cashflow:I assumed a purchase price of $350,000 in the spreadsheet: at 0.7% this yields $2,450 in monthly rental income, while a rental rate of 1.0% yields $3,500, a huge difference of $1,050 per month.What are your thoughts on the analysis and models?

Some programs restrict all residents and others allow varying age groups.

You can talk with your local planning department to determine what the acceptable setbacks are for your area (they vary from place to place).  

For cash flow, I've read a lot of people average $100-$150 per door but that all varies as well but somewhere in that range is the most common.

Insurance bills can vary between buildings, older buildings, and larger buildings usually have higher insurance bills. 

As a buyer you're responsible for paying the closing costs, which can vary slightly in different areas.

@Jennifer Ricardi, I looked at a dozen or so properties before purchasing, the rents varied from $500 up for singles, $550 up for 2 beds.

Installation costs can vary a lot by several thousand dollars.

I'm not super confident on the ARV though because the sell prices in the last 6 mo vary by 100k, but I can't tell what condition these places are in.