Odd permission really. Knock on the door and give the homeless guy that lives there $10 and he lets you in. Pittsburg was a major steel producer but when the plant closed, back in the 70's I think, the town never recovered. This is a highly deprived area, it's so deserted as almost everything is closed. The most active buildings are the drug rehabs. We see one person and a few cars and apparently this was busy, at the weekends you'd see almost no one.