No rule that says you have own your residence to invest in real estate. 

As a general rule the more risk the higher the cap rate but you’ll dig in and learn more.

Can those who use this 'rule of thumb' stir up some conversation and defend your rationale?! 

To learn about the solo 401k loan rules, see the following. https://www.irs.gov/retirement-plans/retirement-pl...

@Jason HowellIn terms of goal setting, there is only one book that I can recommend that really puts into words the way I feel.The 10X Rule by Grant Cardone.  

They should also have a set of rules regarding violations and how you are to be notified, the individual steps, etc.

Sounds like you bought the place well before the rule of FHA loans never lose MIP.

Most banks seem to finance up to 80% of the equity and there are rules of course around how much LTV you can carry).

In fact, illegal on two fronts: it is against the IRS rules (yes, believe it or not, you are required to take deductions you incurred), and it can be construed as mortgage fraud if you overstated your actual income by hiding your business costs.Finally, as @Nicholas Aiola pointed out, all competent lenders add back depreciation during underwriting, so depreciation should not be changed for lending.

@Bob Malecki, there are some strange rules governing reverse mortgages.