The roof rust is not that uncommon, usually on the passenger's side. I've had three Giulias that bubbled up that way, and Conrad's Colli was a veritable iron oxide forest there. Don't know what leads to. This car was not well treated before my time, but it has been a Bay Area car since new, lived outside most of that time. Not under a tree though. The Berlina I had 10 years ago from Oakland did spend a decade under a tree, but didn't rust there, just everywhere else.