Franklin > Status Update

HELP FINDING A NOVEL, PLEASE. It was a fantasy novel published in the 1990s-2000s, set in contemporary California or the West Coast, dealing with a conflict between magic users. The "good guys" were in the north region and the "bad guys" were in the south (L.A.?). The main character traveled south on a mission. One scene had a house grow wings and fly away in an emergency, traumatizing non-magic users who saw it.