I use them to keep squirrels and deer out of my apple & peach trees and birds out of my blueberry bushes.

Turns out proper screening only shows what people have done in the past, not the future.Ok so some simple math using the generic percentages I see often on deal analysis help posts and the $1250 rental price referenced on the original posting.10% capex @ $125 per month5% repairs @ $62.50 per monthEquals $187.50 per month squirrelled away each month.That's 25 months with the canned percentages.

Lots of awesome pointers..I just want to add one thing...I see a lot of people do things like:"I have 3 wives, 38 kids, a cat, 3 dogs a squirrel and a pet rabbit, I have 5 jobs and I only have sunday free from 3PM to 3:14 PM.What can I do to be succesful?"

You can earn 200-400K by 30-40 quite easily with your degree if you are smart and want to optimize compensation, then you can squirrel out 100-200K every year to buy real estate, BRRRR with cash, and by age 40-50 you can comfortably expect to have 100+ units with 10 mil+ portfolio, if you really have the drive and perseverance, I think 500+ units is doable by age 50.

Now we are trying to decide what to do with the unplanned change.

I am doing a refinance on a property in Squirrel Hill West Philadelphia, the appraisers report noted some settlement and stated "the client should obtain a professional opinion from a structural engineer should they have further questions". 

And you should always have some backup cash of your own for unplanned events.

If there are no major surprises, I should end up at $30k for repairs, with 5k left for “planned” contingency, and another 10k for unplanned. 

You can't squirrel away the income for some hoped purchase in future years. 

Unplanned phone calls are the worst for hijacking productivity, trains of thought and efficiency.