Nothing inherently wrong with either, but something to be clear on before investing money, since the controllable successes or failures of a property are going to come down to who is actually putting the deal together and who is running it.I would also be certain how the capital is flowing from deal, through primary sponsor, and down to you, the Spark Rental investor.  

Ultimately, the buyers agents Broker is the one that will have to approve and sign the form and to some extent, may be out of the agents control to negotiate too low.I hope this helps clear it up a bit. 

Not sure what rent control is in place where you are, but you can also use the opportunity to get the rent up to market value.

If she acts up in public and I can’t get her under control quickly I have to leave.

Don't get sucked in by the cheap huckster talk of owning a small slice of some multifamily project where you're not on the title and have no control.

Equity is cash that is controlled by the property...not you. 

I'm in the process of closing on a 4-unit with one heating system for all four, controlled by two thermostats.

But is it still possible to put a sub meter like device on individual units just so I know who may be running a bitcoin operation so I can send notices to the right units in that event?

Appraisals control the ultimate selling price.

SFR has no rent control.