It's neither quick nor easy, but it is life-changing and thus worth it.Flipping and wholesaling is NOT investing, it's a job and it is transactional and the profits (if any) are highly taxable income.

Most “cheaper” and “regular” rental places though don’t generate enough income to worry about taxes anyway so it’s a non issue for most people.

I'm trying to decide between building an Accessory Dwelling Unit (ADU) on my existing property (secured permit) and investing in a rental property in a cheaper market.

@Isaura Orellana why would a S8 office approve rent of $1250, with no included utilities, for a 3 bedroom rental in the City of Detroit, when there are thousands of cheaper rentals?

Since you could exchange in to a cheaper property and not be forced to reinvest that money.  

Should be much cheaper than getting a lease written up by a lawyer yourself.Hope that helps!

Was the for cheaper primary residence or investments? 

I also picked up a home cheaper because the insurance quote the listing agent was giving out was $13.5k and I was able to get it at $6.3k. 

Interest is always taxable, no matter how small.

I would suggest looking into a cheaper market like Columbus Ohio where you can still find positive cash flow, the 1% rule, and tons of appreciation potential.