Do you have a continuous stream of cash for this?  

Many local governments allow for "auxillary dwelling units".

I'm in the same boat as you're, have a little bit of cash savings and have similar goals to build a massive passive income stream.

As others have done, they call the lender asking for a loan on a multi-family, 1-4 family is not multi-family, they are single family attached or detached (1 unit) dwellings. 

Add above to normal dwelling insurance and it seems we are creeping up to $300 to $400 per month just for insurance. 

So an income stream I am employing is offering some units for monthly rental in the off-season.  

Equity in a property simply creates a second income stream that needs to be accounted for.

If it were me, I would require a yearly subscription, to even out the revenue stream, but it could also be done on a true monthly basis with a higher charge for those who don't want to pay for the whole year.Even if the marketplace doesn't have historical data on its own, they should be able to gather the purported historical performance from the sponsor, and verify that in some way.

I want to build a stream of passive income from rental properties so that I can focus on my passions in life: Brazilian Jiu Jitsu, Spearfishing, Cooking, and Learning.

I reach a point that I wanted this year to have the opportunity to recreate a income stream and own property.