When I first read The Intelligent Investor by Benjamin Graham, for example, I just had to be the Enterprising Investor and not the Defensive Investor.Now I look for good investments that generate a sustainable positive net cash flow.

They are only good for temporary construction loans and good luck getting them approved in a timely manner.

If your answer is no, what are some ways to keep transactions professional such as collecting rent in a timely manner?

@Joe Gore - since you are already getting access to this info in a more timely manner, and you see the interest in getting skip trace - have you considered doing that as a sideline extra stream of income?

(of paying off the student loan debt in an accelerated manner.)So, if you're comfortable with a little more leverage, and can continue to qualify for another mortgage, why not buy another rental, instead of paying off the $10k loan?

.: 2020, 2021, 2022...) in which rent was not increased in an amortized manner given the rate of inflation?

Can someone build a sustainable stream of income to last 20, 30 or 40 years in 2-3 years when starting out with no financial resources or experience? 

Sustainable inflation.

Cash flow gets taxed.The appreciation when extracted can be used to purchase subsequent properties just like the cash flow, but without having paid any taxes on it.New investors often need the cash flow to sustain the property. 

While it is not ideal, managing 150+ units and having tenants just to pull one over on you leads to you needing to handle things in a very business like manner.