The electric ones you plug into the wall also work and are based on the same thing using frequencies to scare them off.

And I plan to change the code with some frequency.

@Brandon Hall There are 9 standards that the IRS traditionaly has  used to determine if a taxpayer is a dealer or investor:1. reason and purpose the property was acquired2. lenght of time property held3. number and frequency of sales, usually annually4. continuity of sales over period of time5. overall reluctance to sell property6. substantiality of gain on sale7. extent to which tp engaged in sales activities8. substantiality of sales when compared to other sources of income9. desire to liquidate The taxpayer does not need to meet all 9 or any number.

Each of these, and everything else in the property, require maintenance and replacing at a certain frequency plus occasionally when you don't expect it.

You may even find it's just a really simple problem in a very limited area (like 2x1 feet) that has to do with improper chimney flashing (this happens with extraordinary frequency here).With any sort of competent preventative maintenance efforts, the "good side" is easily going to last you the twenty years you're going to hold this property in your portfolio.

So, ultimately, you are the one responsible for ensuring your IRA transactions are within the rules, regardless of which structural approach you choose - custodian held or truly self-directed with the checkbook LLC model.In some cases where the dollar value is lower and the account is being invested in relatively static assets without time-sensitivity or frequency of transactions, a custodian serving as intermediary can be a fine solution. 

I'm averaging a cost of 12 cents a touch this way and hitting a frequency of 9+ a month. 

As a result of this sudden increase in frequency of large hurricanes, it has become clear how big of a hit insurance providers are taking on.

In my experience, newer homes in great neighborhoods may not: 1) have the type or frequency of vacancy that the spreadsheet projects out (4% vacancy assumption means the house is vacant 2 weeks a year...generally see renters stay in a home over a year, so your vacancy is drastically down), and 2) Newer homes can generally come with less expenses and capex; the tenants also treat A or B+ class homes better so there's just a lot less wear and tear which is usually reflected in your maintenance/repairs being lower than budgeted.If you go the Airbnb route, just drop HOA'd communities from your search criteria.

Your HOA  didn’t start to question the frequency of “broken leases”?