Many so-called "income properties" don't produce nearly the kinds of returns we see advertised on the internet. 

It's used to determine the cost of producing a product or service, and is a key tool for businesses to remain competitive and profitable.

I don't know.So for $56,000 dollars down plus (an estimated) $7,500 in closing costs plus another $5000 in furnishings, you get an asset that produces about $500 dollars a month. $68,500 / $500 per month = about 12.4 years to get back the intial investment.  

On the other hand, you build wealth by having income producing assets.

It is possible to achieve better returns, but this property has already produced outstanding return and requires little effort for this return.Good luck

The articles conclusions MAY be self serving - we need to look closely  to perceive any motivations for WHY the writer is producing the article. 

One portfolio gives me cash flow and debt pay down, while the other produces appreciation in addition to the other benefits.  

Theoretically, I would guess an ADU adds value to the property because there is an additional income producing unit. 

To be worth the effort, it should produce return significantly greater than passive options.  

And if you're investing in a syndication that typically produces K-1's late in the tax season (such as a GP fund) this can make things very tight and/or cause extra tax bills from having to do estimates extra tax work with your CPA.