Architecture in Sao Paulo

Sao Paulo is a weird city. I knew very little about it before I left but I assumed it would be an awesome city just because of how large it is. It's the largest city in Brazil and perhaps the second largest in North and South America (after Mexico city I believe). If I have to sum it up in one word I would say industrial. There are a lot of plain buildings but the ones that have more personality are the ones with a mix of european and portuguese architecture. The center of the city of stuffed with homeless and business people during the week and exclusively homeless people during the weekend. Both the rich and the poor parts of town are blanketed in a thick layer of graffiti- some works better than others.