It’s probably a uniquely American thing, similar to how many malls are dying here while they thrive in Europe. Cities have been dying a slow death since like the 70s here because suburbs are a net loss in terms of revenue because they’re more expensive to maintain than the taxes they bring in, so the only way cities can afford them is to sell more land to developers to build more suburbs, which then cost the city money, and repeat into infinity.
Cities have also had a general decline in the population within urban areas during that time, with people moving out to the suburbs for the “American Dream” of owning your own house with a white picket fence, 2.5 kids, and a cat or dog (and to avoid having to look at any poor people, immigrants, or black people). This was exacerbated further during COVID as people fled denser areas. The house prices in my town that’s about an hour away from one of the most expensive cities in the country (comparable to LA prices in the city here) jumped up practically 50% during COVID while prices in the city dropped something like 20% during the first year. Prices in the city have since come back up and are now above what they were before, but prices here never came down.
Cities here also tend to have a business district, sometimes even a “central business district” that’s at the heart of the city, which is made up almost exclusively of office buildings/other companies, with workers commuting into the city. Even my town has people who drive every day to their job in the city. With many of these buildings sitting empty during COVID, there’s been a push for urban renewal by converting them into apartments, but that’s easier said than done. Offices simply don’t have the same infrastructure that apartments need in terms of basic things like plumbing, and would need to be entirely gutted, but it would be a much needed fresh supply of housing that would probably help reinvigorate these city centers.