I have been lucky enough to go the Chicago for the part of the winter break. One of the visits I really wanted to make was to Pumping Station: One. Here are some pictures:
Based off the their last board meeting they have about 400 members and about $19,500 a month in member dues.
https://wiki.pumpingstationone.org/Board_Meeting_Notes_2016-08-02
They have just expanded and taken over the remaining half of the building. So part of the mess is just them moving their equipment around. I had a great time looking around and they seemed to have great community culture with many wonderful “character” elements throughout.