No one is saying the tenements were desirable, or wishes for them to come back. What we want is the construction of more dense residential housing that can meet or exceed that population density while providing good quality of life. Said construction is entirely possible, doable, and profitable, except that zoning prohibits it in most places.
to save anyone else a search.
> I don’t think that density is coming back or desirable.
I think there's plenty of examples of dense cities (certainly far denser than most US cities) that aren't full of death-trap tenements and it's borderline intellectually dishonest to equate density with that.
In fact, letting NIMBYs have free rein to obstruct/delay/interdict housing construction is far more likely to cause overcrowded/unsafe living situations (which include homelessness) than the other way around.
Hundreds of thousands would live on a street that now houses a thousand people.
I don’t think that density is coming back or desirable.