The best way to find them is to send out mailers.Some good lists to target are Absentee Owners with Equity, Seniors with Long-time Ownership and Homeowners with Low Financial Stability Scores.You can work with a list broker to optimize your list for your area.

Every month he sends the payment after collecting their shares of the bill.

That's great advice because you need to be cognizant of Fair Debt Collection laws. 

I did fully close this property myself and collected rent for 2 months before selling the house.  

Make sure you verify the expenses to include getting actual financial data from the owner from tax returns and bank statements to verify actual rent collected especially since they were “generous” with rent. 

Initial $7,536 will be collected for materials.  2.

With The way  the non-advalorem taxes are collected the Seller of the relinquished property ended up with 189 credit and they were concerned with taking any cash as a result of a sale thinking it may trigger a tax event... so they opted to have that credit increase the amount of proceeds they received.

I was able to receive maintenance requests, automate rent collection and syndicate my listings.

The Recorders office collects various fees and how the fees effect landlords as we do multiply transactions.

I mean for as a portal to collect rent, screen tenants, and list properties.