Value add renovations, streamlining operational costs, acquiring off market/below market, rent increases (inline with current market & post reno, creating appreciation via increased NOI), incremental revenue streams, operating in growth markets (driven by data) - these are all ways to deliver returns. 

You should be mainly concerned with cash flow and increasing income streams of cash flowing properties.

Be sure it still has +cash flow and you are building income streams for retirement. 

Are there actually legit vendors that have cash buyers other than Prop Stream?

“Wealth is an income stream”.Want to build Wealth faster?

Streaming only.

However, chances are your taxes are not going to get much more complicated until you start seeing multiple streams of income through different LLCs & asset classes.

I personally am striving for creating and growing passive income streams.

., outdoor movies every Tuesday night, a small general store that sells "Hard Liquor", wine and beer, as well as hot dogs, chips and soda near the road so passersby can purchase too.

You are adding multiple properties to your portfolio and in the end when they are paid off or mostly paid down you now have a higher stream of guaranteed income and equity to use at your free will.