I wish I knew a location of a glut of real estate For Sale signs. That would be the best. I am willing to drive around some neighborhoods to find such an area, if anyone has a lead.
I like a Voice photo of two downtown condos at night. Only a couple lights were turned on, showing they are mostly vacant. The shot was taken between two towers.
My friend suggested if you want to be dramatic, a picture of a house auction. I think they are held Thursday mornings at the downtown court house on Broadway at 10 am. The auctioneer stands outside on the courthouse steps, and the bidders stand around him. It went on for 30 minutes the day I was at the courhouse a few weeks ago.