There are exceptions to this rule."

I have it and it's awesomeVacancies will vary per area...a quick internet search for your particular market will help with this but as a rule of thumb you can budget 10% of your property's incomeCAP Ex and Maintenance can also vary depending on how much work you put into your rehab on the front end, but be conservative with your budget so you don't get caught with a costly expense you're not expecting.  

In any investment vehicle...real estate, bonds, dividends, this is a fundamental rule in investing.

@Kim Wendland Thanks Kim using the bigger pockets calculator and the 50% rule feature it shows it cash flowing $343 a month.

@John Underwood always has fantastic advice. 

But one thing we have is the laws and rules and if they are bad they get shut down. 

If you pursue it, just be careful to read up on the building department's rules to ensure you can figure out what you are and aren't allowed to do. 

A trust can quickly auction off a property depending on state rules.

@Jon AllenThe implementation of the LLC under the umbrella of the IRA does not change the rules in any way. 

These would not be flips and the purchase would not fit the 70% rule.