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The neighbourhood. When I moved to New York in my twenties, I had roommates. Everyone had roommates. That meant sharing a bathroom and kitchen. Not only did this breed camaraderie and teach me to not be a dick, it also freed up cash so I could enjoy the city and save.
It just so happens that America is luckily predisposed to this kind of living, with an abundance of space to accommodate lots of people in their own non-shared living spaces. The problem with that though is that you limit the opportunities for business, because space is cheap, so you have to implement regulations and zoning to create opportunities for moneymaking and before you know it you can't actually build housing anymore, despite the abundance of space sitting right there.
American cities were replete with dorm room style housing. These were especially popular with new migrants to the city.
An incredibly large percentage of apartments in cities like NYC are used as multi family housing with several housemates sharing them to save on rent.
The reality is that the reason such housing doesn’t exist/isn’t more widespread is because cities have passed laws eliminating them. Before the white flight to the suburbs, the attempt was to keep the poor out of cities where the rich lived by eliminating housing of this sort since the poor couldn’t afford single family housing.
This led to a proliferation of laws that required bathrooms and kitchens in every unit, etc.
The arguments against conversion assume you care about the current owner's financial situation.
You'd also have to install a bunch of showers, which could be a significant problem on its own.
And then there's the increased amount of sewage, which the building might not be able to handle - even the local sewers might not be equipped to handle the uh... Load a large commercial building would generate with 24/7 occupancy vs 8/5 occupancy.
The reason you don't see folks converting commercial spaces into residential isn't because it's not wildly profitable, but because building new purpose-built residential buildings would be cheaper than a conversion for anything other than one or two floors.
Compared to installing a new domestic water pipe riser and drains in an office tower (plus pumps, pressure tanks, etc), installing a shower in each unit is essentially free.
Connect the in-unit supply lines to the tap, core drill a hole in the floor to get to the floor below and connect to the drain piping, done.
They have been going wild in the UK converting office space to residential.
How is there more than an office full of people?
I do see this. That's my point. Your plumbing problem has been solved by not jamming a ton of people into the building.
So they can support high density human habitation according to the Feds, but not normal housing according to who?
I still haven't seen numbers that show this is a physics problem versus zoning problem. Worst case, make some things (e.g. washers and dryers, maybe even showers) communal.
Obviously since it's illegal these aren't advertised but they're quite prevalent, and issues are rare enough that now decade past muh Ghost Ship Warehouse is the constant drum being beat by the brain dead building code worshippers who actually bought the line of bullshit that having people homeless and freezing and shitting in the streets was actually a 'written in blood' advantage.
