Duplex Classified as Single Family Residence

[Armando Raygoza]

Hello all,

I came across a duplex in Phoenix, AZ but realized that it is classified as a single family residence.  What does this mean?

The idea is to purchase it, owner occupy and rent out the other unit.  Also would like to note that it is zoned R-3. 

A few questions that pop up to mind are;

1. Will I be allowed to rent out the other unit?

2. Was the second unit permitted?

Any input is greatly appreciated.