Some of these big courtyard buildings in Chicago had 4-6 entrances,and each entrance might be numbered 6953 (apartments to the left of the lobby) and 6955 (apartments to the right of the lobby), so I imagine you are correct. The last building I lived in was a six-flat - 7719 to the left of the entrance and 7721 to the right. I'll have to get some more input from my sister since I can't find it on the Cook County Assessor's site. All they show are some little bungalows and the like. I think there must have been some renumbering. Hard to believe they'd tear down a building that size. Thanks for your time. Joan