I find it interesting that the author uses one of the worst examples of real estate investing to prove his point.

The 2020 BiggerPockets Insights Market Study examines the 552 largest markets in the United States to help investors of all types and experience levels understand how various locales across the U.S. compare to one another.Over the next few months, we’ll be releasing more BPInsights studies similar to this one for mid-sized and small markets.

In your instance, there is no discrimination because nobody is allowed to live in these illegal ADUs.In addition, even if there was a legitimate disability, you would still need to prove that this person is a caretaker. 

I started studying real estate investing probably 20+ years ago and just never had the courage to try any of it.

But now that I actually have properties it hits on another level.I also started studying private money, SDIRA, hard money, and 401k money funding deals.Right now I have 3 rentals (all SFH ).

I would also suggest you could study real estate investing as much you can in a certain area you are interested in putting your own money, and ways to do investments, generally.

If you are unsure of cost talk to your command financial specialist to prove you can afford it.It'll pay off on the backend.

That's right it stands to reason why it helps to look at the larger picture and perform a analysis on the economy and the understanding the economics is is just a guessing game believe me I study economics Wharton School of Business:)                                                                                                                       Have a great day

Anything that cane prove they did a switcharoo and help  get them evicted if it comes to that.

I've been studying for a long time and most say it's Direct Mail.