Permit to rent a duplex?

[Jesse O.]

So I got a visit from code enforcement at my latest duplex in Pasco county florida today. I was not there, but they left a "courtesy notice" that says I need to get a permit to rent out a duplex. I never heard of this (have only owned duplexes for 2 years now) though, I will call the permit office tomorrow to see what it's about, and what this costs, but curious if others have had this?