This will be common on any form of digital payment going forward.

The two most common...1.

It's commonly done where I am on commercial parcels that have multiple tenants on ground leases, the reason being to create their own tax bill for payment.

Boarding house type rentals are actually pretty common in college towns. 

I've cultivated contacts and what not amongst some professionals involved (I have a personal banker!

You also had to pay for an background check before seeing it which while common I fear drives people away.  

What would a common commission in this situation?

[can you develop with some kind of tiny home communitity and subdivide as a tenant in common or co-op - give owners a stake in the project and do seller finance and keep the difference in mortgage payment -ie create equity through higher sales price with seller financing etc - big need for non traditional financing etc.]8.

Is this common and legit?

There are a lot of ways to do no money down deals but none of them are common or easy.