How to Find a Duplex

[Carlos Paz]

Hello BP Community. I'm looking for a Duplex in the Charlotte, NC area. I'm trying to pull a list of addresses for direct mail, so I select the option of Property Type: "Residential Multifamily" (cause by selecting Residential Duplex I get 0). 

I was wondering why my list does not include all the duplex addresses?. When I look a particular Duplex address in a website like Realtor or Zillow, some are described as a "Single Family Residential". I guess this is because each house has it's own number (unit #1, unit #2). Same when I look at the public records, it will come as a Single Family Residential in the Land Use description (it does show Duplex-Triplex in the Built Use/Style description).

So how can I refresh my search that can include both units (#1 and #2) in the address so it doesn't exclude the ones describe as SFR? or in the other case, how to know if a SFR is part of a Duplex-Triplex?

Thank You for your help.

Carlos