for cash flow you may want to consider duplex and or 4 plex.. the same mortgage slot you use up for a SFR can buy you 2 to 4 doors..

Also, @Jonathan Orr had some good ideas with property shark and compstak, but compstack is limited to certain geographical areas.

I spend a lot of time in the ocean and pay little to no attention to the many sharks lurking below the surface.  

My prediction - Greg S has very few problems with tenants and his rentals run like fine tuned machines and pay like slot machines.  

Like borrowing from a loan shark.  

Tenants who are the "complainers," can smell weakness like a shark LOL.  

He then places that in a drawer that has a mail slot in it.  

But, that slot machine was just ready to pay out, she just knew it...and there was that envelope with all that cash in it in her purse...

If someone is late for their time slot, they would go to back of the line if there are multiple applications. 

HUD give a maximum number of voucher slots and funds to the housing Authority and once that is filled the only options is to wait to see if vouchers are taken away from tenants violating policy or to wait the following fiscal year.