And if you plan on using a real estate agent to rent out the unit in the future, then that is an additional cost to factor in. 

But, the inspectors kept coming up with additional code requirements that they normally don't require.

Then rent out 100% of the 4plex and use that additional cash flow to offset the new property. 

Ramin,In addition to what Patrick stated, understanding to cost to rehab the property is VERY important.

@Noah Farley In addition to Trulia and Zillow there are a lot of of smaller websites out there that can offer solid leads for these types of properties.

This is a modern , efficient and green way to bring in great cash flow.

It was a simple letter with no additional details aside from the new loan number and address of the new bank.  

What channels are most efficient for getting a decent deal-flow on these deals?

In order to avoid any Fair Housing issues, this really should come down to what do your published screening requirements state about a bankruptcy (in addition to credit, income, criminal record, etc)?

The other is much lower but is a fixer upper that would probably require work that would bring the total cost to be $140,000 with the addition of the money to do repairs.