David,if your IRA does not have funds and is unable to make a purchase on it's own, using personal funds to make joint investment would be considered enabling and is prohibited transaction.

Self-directed Solo 401k plan is a great choice, it will not only enable you to invest in alternative assets, but it is also great tax-sheltering vehicle, allowing you to shelter up to $53,000 per year from your income.Good luck! 

The scenario you described would enable you to repay that Lender back upon refi, but would likely NOT give you any "free" dollars from your next Lender for your next Buy.ie.

Technology has enabled communication with a remote CPA through phone calls, emails, skype etc.

This creates scarcity and enables owners of the scarce resource to realize value.To dig deeper, I recommend that you review research reports published by the major national brokerage firms.  

I'm a musician (NEVER play at home, I have a studio for that when I need to rehearse or record) I am also a skilled videographer (I film shows for other musicians whose websites I also produce and maintain.I do all of this without a specific business title, because it's free lance.

Yes, you will end up with ~$4K in closing costs per refi, but if you free up enough cash to retire some other debt, enabling more purchases, it will be worth it.

enabled trail cams that probably alert you in real time (which would act just like the other traditional security systems).

I have found I'm better to just pay the half month's rent to enable a company to show the property, run the background checks, and meet the valid candidates after all the tire kickers have been filtered down to paying the application fee. 

Also you can get a pretty good security system that’s WiFi enabled for under $200 bucks on amazon.