Any tips for success for investing in the west side of Detroit's real estate market (especially lists of due diligence questions to ask before purchasing duplexes there)?

For example, if the multifamily has positive cashflow it will also fit for a condo conversion. 

Oakland has strict rent control laws, like San Francisco, Berkeley, and many other cities, however there is an exemption for both duplexes and triplexes when the owner lives there as their primary residence.  

Read "Rich Dad Poor Dad" and working my way through "Cashflow Quadrant" and the other books by Brandon are sitting in my queue.Currently struggling with deciding on an area to invest in, already decided to invest in b or c class, not sure about duplex or SFH yet.

For clarification are you meaning 5 or more units per property or as in buying wholesale duplex, tris, and quads?

I looked at two duplexes (C Neighborhood).

I have gotten into real estate last year with my first property a triplex and have since then bought a duplex. 

Another option would be to get private funding thru a family member / friend and they can place a 2nd lein on your duplex as collateral. 

I just purchased my first duplex. 

@Igor Messano are you saying this is a condo that has structural issues?...