There's already enough plumbing in there for a whole office to shit when they get to the office.
History favors the bold, and code inspectors blabbering about "written in blood" don't see all the homeless people they kill via reduced access to housing.
I've seen plenty of artist collectives that manage it; on paper they are office/industrial but actually everyone lives there. Every once in awhile one burns down but the mortality rate isn't as high as living on the streets which is ultimately what happens to those on the bottom of the socio-economic pyramid when the ones higher up push the ones under them down a rung to snag housing.
> There's already enough plumbing in there for a whole office to shit when they get to the office.
A 20,000 sq ft office tower floor will usually have a single set of restrooms and a couple of kitchen sinks, maybe a dishwasher, plus a couple 6-gallon or instahot water heaters. If you subdivide that floor into a dozen units, that’s 12 showers, 12 washers, 12 dishwashers, 12 toilets, 24 sinks, and 12 water heaters.
The riser and drain pipes aren’t big enough to handle residential needs.
For a lot of the office buildings I've been in, there aren't that many toilets per floor. Its also different when you've got some toilets that are often unused compared to people running laundry, cooking, bathing, etc. Very different demands on the plumbing system.
You also then had everything pretty much isolated to two rooms for an entire floor meanwhile now every unit is going to have a separate kitchen, a bathroom (or two, or three), a laundry room, etc.
And you're going to need a good bit of engineering studies done before you start cutting that many holes in the floor.
Artists are a shrinking population, I wonder if having most of the top floors (20 out of 30) converted to extremely large luxury apartments (5000sqft+) and only 'adding capacity'to plumbing and what not for the lower 10 floors, which would house smaller units, would be economically viable. Although actual luxury market requires high ceiling so probably wouldn't work out.
I'm sure many many people have thought of all sort of solutions as the value for finding some sort of solution is extremely high.