These buildings were almost certainly concrete husks without any interiors, electrical, plumbing, HVAC, etc. In fact, it seems from the video that most lacked an outer skin as well. These were all built for real estate speculation purposes and would probably never be finished and occupied. And that's assuming that they were built to proper safety standards. Many of these so called "tofu dregs" projects were built without proper rebar or binding material for the concrete and are absolutely unsafe for occupation.