Then multiply the square footage by the going rate for your area and see whether you'd come out ahead or behind.What would you do with the space?

Now take that $400 and multiply it by the above 20% tax rate and you only save an incremental $80 on your tax liability over the standard.

They multiply this mistake over a number of units and end up being overleveraged.

An extra $25/mo is only a few lattes for them but $300/year to you multiplied by # of units. 

Some types of small black ants need to be sprayed by knowledgeable exterminators because they will multiply with a poorly conducted spraying and have more than one queen.

Doesn't meet the 3x income/rental multiplier

@Brian Turnbough Any improvement to all units adds value times six and the SFR doesn't have any such multiplier; just dollar for dollar.

@Kevin Thomas You definitely want to nip this in the bud as rodents tend to multiply and their feces can cause health issues if it becomes an infestation.  

The annual column is only multiplied by 12 to create the annual numbers, maybe this is incorrect.

Property taxes and insurance premiums vary way to much in different states for it to make sense to me to use it.If you're asking about what kind of rule of thumb to use to determine if a property is worth further investigation, I personally use the GRM (gross rent multiplier) rule of thumb, because that's what I was taught.