If you don't have enough Solo 401k funds to purchase the property as an all-cash deal, you can combine your Solo 401k funds with non-recourse debt to purchase the investment property.

Combining the two might be what you're looking for.Best of luck!

Ideally it would combine a CRM, calendar, timeline, etc. 

A few things to think about:21% combined for CapEx and Maintenance is pretty high.

At the same time, see if the lender will do a HELOC to allow you to tap into the additional equity you have.I also think you would be well served to underwrite a bit more conservatively. 10% combined for CapEx and Maintenance is low.

(I'm wary to believe that, due to other bad advice and mistakes on my return.)Also, I'd probably rather not aggregate the three properties, since based on that article:If a qualifying real estate professional makes the election to aggregate all rental activities for purposes of measuring material participation, the combined rental real estate activity is treated as a single activity for all purposes of Sec. 469, including the disposition rules of Sec. 469(g).

Is purchasing the property next door to combine my lots into 16k sqft total worth it?

As a lOKal yokel specific combination of Del City and section 8 makes me want to run for the hills (which if you’re familiar with our landscape means “a very long way”).I’m happy to add value in any and every way possible.  

I’d recommend getting a specific quote from an insurance broker for the property you are looking at so that you aren’t surprised.A 4-plex I own make a good example:  because of the combination of factors with it (age, flat roof, being a 4-plex) the insurance costs are 3x what any calculator predicts it should be (because most calculator tools use area averages based on the value of the home, instead of the actual home in all of its glory).

I'm sure you'll get a lot of "college doesn't matter" comments on here but if you're already doing it, I'd suggest either emphasis of or combination of Finance, Accounting, Marketing, Economics.