It was cheaper to simply let things fall into disrepair, and build shiny new buildings and developments further away from the city center. Rinse and repeat. This is why a lot of inner ring suburbs are filled with strip malls that can't maintain their parking lots, don't have the residential density to support nearby businesses, etc.
It's kind of an interesting development pattern that's been pervasive since the 1950s, and some towns and cities are trying to reverse it with infill.
We've intentionally made it unconscionably expensive to bring anything not built to current standard back into service even in a limited capacity (e.g. sublet a factory into smaller space) because we have because this stuff is mostly the purview of local governments who seem to optimize for some middle-ish ground path of "what makes Karen screech least" and "what makes the professional developers who know everyone in government happiest". There's various exemptions for small residential stuff, but at scale it's all just crap that tends toward "don't allow anything that isn't a new build or a high dollar revitalization project"
Seriously, go to your local zoning board, planning board, etc public facing meetings sometime. The shit they put people who just want to spend huge sums of money to develop stuff, run businesses etc, in your city/town through is beyond the pale. And then some "professional" shows up with a BigCo packet about "here's why our toxic waste dump on the ground floor with a strip club on the top floor can go beside the school" and they can't approve it fast enough. You'll be looking for bulldozers on facebook marketplace before the meeting is half over.
There's almost no overlap between people on and with the means and time to go to planning and zoning meanings and the people who have the greatest marginal utility lowering the bar to owning a business or a home.
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Recommend a source?
I do the bulk of my shopping IRL.
Meanwhile all the shithole land with no "dwelling" on it was never eligible for mortgages so people weren't able to bid it up to oblivion on debt that they locked in with 30 year mortgages so you get weird results like the cost of vacant land is way cheaper than the same piece of land with a house that can really only be bulldozed (latter would be cheaper in most times in history). End result is I built an entire house on property cheaper than a burned out uninhabitable trailer. Building on unmortgagable land is a way to bypass the fact houses are all locked up in 30 year loans at negative real interest rates.
End result is it's far cheaper to build a house than buy even a shitty burned out one because to do the latter you have to buy someone out of their money printing machine of a negative real rate loan, which obviously they are only willing to do for a king's ransom.
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I won't share my address but if you are looking to do this yourself: look up fishing canneries in Alaska, most of them are close enough to cheap plots you could do this on, often even without permits or property tax. These canneries are also usually desperate for workers and pay a livable wage to those with refrigeration technology certifications.
Build a new luxury apartment, and someone moves from a mid tier apartment into it, and someone moves from an affordable apartment into that, and so on.
Price is a function of constrained supply. The type of supply is not important to increase the numbers.
The arguments against conversion assume you care about the current owner's financial situation.
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.
And the usual demographics where support for such boondoggles throughout history is found will cheer for it because they'll dress it up in environmentalism and 15-min cities and whatever the other issues of the day are.
you're basically rebuilding from scratch at that point.