@Schopenhauer1 During the pandemic (now running into its 4th year) offices were closed and employees in offices were given the means to work from / at home, The numbers of people not needing transit or a car trip downtown was big enough to produce a crisis in the office real estate market. Many billions of dollars worth of office space across the country are empty. This reveals two things:
First, technology makes it possible for many people to work at home. Good? Bad? It depends. It depends. In a cartoon from 2020, two cats ask, "When are they going to leave?" and "Why don't they just go outside and die." Initially many people didn't like it; now, as their employers are dithering over office rent, most don't want to go back to the daily commute.
Secondly, changing one thing (hundreds of thousands of office workers at home) can have adverse effects elsewhere in the economy. Work from home (wfh) was a boon to communication businesses. Think Zoom. At the same time wfh was a disaster for transit -- millions of fares foregone,
Central business district support businesses were devastated. Cafes, caterers, small stores, etc. tanked all over the place. The usual unlovely elements moved in to fill the vacuum created by absent office workers.
City planners aren't sure whether their downtowns will find ways to become even moderately interesting please to be. Convert the office to towers to apartments? This is only sometimes economically feasible. Buildings with narrow floor plates can convert offices to living spaces, though it is expensive to add plumbing for baths and kitchens and HVAC for individual units. Large square or wide rectangular office buildings (the most common kind) have too large a floor plate. Apartments arranged along the outside edge, where the windows are, leaves a large cavity in the center of each floor that just isn't usable for much. Air shaft? Atrium? Again, generally not economically feasible.
How many people living downtown add up to an interesting city? I don't know, but a lot more than who are presently living there. I'd say... let's say... could be... 25,000 residents downtown could make for an interesting city that didn't depend on office workers.
Minneapolis has about 50,000 people living in a very generously defined downtown. These 50,000 are not a dense enough concentration for the amount of area they live in. 400,000 people live in Minneapolis, and they don't make downtown an interesting place, because most of them never drive -- never drove -- downtown,
Why did they not drive downtown? Because there are scary unpleasant things downtown, like one way streets, parking meters, the dreaded cultural diversity, no enclosed shopping centers, parking lots charging money to enter, busses all over, too many stop lights... It's a nightmare!