TL;DR:
Bannon owns two properties in So Cal, a condo in LA, and a house in Laguna Beach. He spends a lot of time in NYC and DC. It does not appear he has ever lived in FL. His ex wife does live in FL, but not at the house he was registered to vote. Florida does not tax unearned income (interest, dividends, royalties, etc). California does. Making it appear that he lives in FL may be him trying to avoid state taxes.