Earlier quoted context omitted.
This is a feel good comment, but the reality is these building are not designed for residential use and would require substantial build out to be habitable for multiple residents. Now if the thought is just to move the homeless eyesore out of site, then open office space might work.
To bring it up to code, is a very different situation than make it livable, especially when compared to living in a tent on the street. If you gave me a floor of a commerical building that was mine, that I was allowed to build in and improve how I saw fit, I'd take that in a heartbeat. If there's an Kafkaesque set of red tape, then forget it.
No, we need massive zoning & code reform but not a total free-for-all. You may be resourceful enough to build a safe habitat but there's a good chance all your work will be destroyed because someone decided to build an indoor slum out of pallets and space heaters.
All safety regulations are written in blood.
[0] https://en.m.wikipedia.org/wiki/Ghost_Ship_warehouse_fire