The "business activities" you are describing would be considered self-dealing if you used your 401(k) or SDIRA funds to invest in themWithout a holistic view of your financial setup it is really hard to advise you on the tradeoffs associated with investing funds on a tax-advantaged basis.

Finally, from a holistic approach, someone buying a $2 million apartment building in cash probably has other investments.

To take advantage of these great opportunities, you must think like a holistic investor.

In any event I wish everyone a HOLISTICALLY HEALTHY NEW YEAR!

Just take it all in and create a holistic plan.  

Also keep a holistic approach to your rent increase.

I'm in the process of buying my third property, and am starting to think about how I can create a holistic financial picture of my entire portfolio (rather than manage each property individually).

Lawyers have a holistic education when it comes to the law.

For new buyers in the bay, the risk outweighs the appreciation potential since its so heavily priced in..which contributes to  the recent Cali capitol in other states.Not to say that there aren't opportunities everywhere, but when you look holistically at least in the Bay area, the markets past few years have outperformed RE for the layman.

Each of the people speaking is holistically rated on all three of these sub-categories.