... they started opening up in abandoned (but interesting) buildings where nobody wanted to spend the money to restore them to their former glory. Some didn’t have a roof (and still don’t), while others had a big courtyard offering ample space for revelers. Set up a bar, get the toilets working, and you’re set. Eventually some expanded to take over several adjoining buildings. The first ones were a success, others followed, and now they’re a fixture on the nightlife circuit... — travel.usatoday.com