@Steve Babiak is absolutely right.I've said it many times buying at tax sales is the most hazardous way to buy real estate.

City won't let you rent out basement, but owner can live in basement.It may suck for 1-2 years, but then you'll have gained so much knowledge you can do better on the next one!

You can live in one unit and rent out the other three.

One of my quotes, "Repetition is the mother of learning," is that the more time you run analysis and comps, the easier it gets. 

Quote from @Kevin Lynch: Greetings,I'm excited to join the BiggerPockets community, though I've been an avid listener of the podcasts for some time now.

I think AI will continue to get better with time but robots will never be able to build true trust because they have no feelings. 

No evictions, no felonies, 2 1/2 times income.

Of course it is very important to do proper due diligence on the investment and the operator.As far as self-directed IRA there are number of companies offering such service, this topic has been discussed here on the forum many times so you should search using this keyword and learn from those discussions.

@Moshe H.No, not all the time, but the low contributors do not wish to lose it. 

Have industrial property values been relatively stable over time?