So hopefully you're using a real estate agent to help you figure everything out, but here are some useful places to look for information.
Code Violations: http://www.miamidade.gov/building/regulation.asp
Tax Records: http://www.miamidade.gov/pa/property_search.asp
Pit Bull Ban: http://www.miamidade.gov/animals/pitbull-law.asp
Tax Records: http://www.broward.org/recordstaxestreasury/Pages/Default.aspx
Palm Beach County