I went to the link that Lazlo posted. They showed photos of the Studebaker factory. They closed it in 1956 and the buildings now are 55 years since they were maintained. It is all crumbling.
Some youngsters had videos on youtube of office buildings downtown. They walked through office and one was a stock brokerage. It looks like one day in the early 1970s - they people never came back.
Just about everything was left in the office building. It looks like the photos or Chernobyl or something. It is like the plague of liberalism swept through and people ran for their lives (w**te flight) and abandoned the place on one day. .
Last year or so I ran across a site that had pics of houses that were so overgrown they were like artwork. I am going to see if I can find it...