Basically the entire stretch from Chicago to Division was nightclubs, strip clubs, restaurants, porn shops, etc. Some of the last few vestiges of the old strip were only recently demolished, like the 4-story red brick building where the one-story crapbox Lulemon is going across the street from Elysian, and the buildings taken down at the north end of that block to build the new Barney's. The Elysian site would be in the background here (looking south from the other end of the block as the top photo in the postcard above):
I guess neighbors considered it all a blight, and bit by bit the vice district was more or less eliminated through regulation and/or development, or otherwise truncated to the high-end/high-price stuff that remains between Oak and Elm.
While I agree with tup that in certain regards the changes have been positive, I do wish I had been of a mind to take in my surroundings a bit more carefully the few times I was in the area before it was irrevocably changed from the late 80s through today, rather than having to rely only on photographs