I would be interested to see before and after shots. Was their advertising problem really so bad or was just about the same as any other city? Edit: Found one: http://banbillboardblight.org/?page_id=4251
So they didn't eliminate all signage, but it was rather dramatically reduced. I grew up in a suburb of Minneapolis that had similar restrictions on advertising, and I can say that it is very nice as a resident. Now when I visit however, I find it difficult to locate some of the new businesses. I'm curious how this law has affected business revenue from tourists in Sao Paulo.
I'd be shocked if many people, on this site in paritcular, used street ads as their primary means of locating new businesses they'd been wanting to find.