He is one of her many nephews and nieces, who took over the house and it's a hub for crack and prostitution. 

They could 1031 exchange their properties into a passive income stream such as a DST.

They are jobs.If you want to create a low effort income stream (I would not refer to even buy and hold RE as truly passive) then BRRRR is a good approach. 

The length and stability of the property’s income stream is what drives value.

Constant stream of repairs, and not local, so $$$ (and poor) property management.  

My overall goal is to develop a secondary income stream via real estate, not necessarily through residential RE though. 

Seems to be a cheap way to get money without pulling 401k or other retirement streams. 

Every income property has two separate income streams, one generated by the property the other by your cash/ equity.Buying cash flow today costs twice as much as the prevailing mortgage interest rates based on the opportunity value of money to investors. 

Brokers have the ability to stop syndicating their listings to Trulia and Zillow and other third-party sites with a simple click of a mouse.My brokerage, Hub Edge Realty, has never syndicated its listings to any third-party sites except Realtor.com, because Hub Edge Realty's MLS, MLS PIN, has a pre-existing agreement with Realtor.com, and MLS PIN Homes, because it's MLS PIN's own search site and is not bedraggled with competitors' advertisements.

That's great when you can do it but with a rental property, you make your money through the long term cash flow income stream, the mortgage pay down by your tenants, and hopefully some appreciation.