Sure, but nobody at the local level wants to downzone offices. Those are their jobs. And they bring in tax revenue without requiring much expenditure by the local municipality. And their proximity skyrockets the price of all of the nearby real estate. There are perverse financial incentives that cause every city to want to be the city that people from the surrounding area commute to work in, but don’t actually live in. So downzoning offices isn’t going to happen at the local level. And it’s not going to happen at the state level either, because frankly it’s a silly idea to cripple your own economy.

That's a great question, have you got any thoughts on why?

The topic has come up once or twice on HN before, so maybe try searching for "new cities" or something like that.

- All existing land is already claimed by someone, or by the government. There are insanely large parcels owned by individuals or small groups.

- Most existing water is claimed by someone hundreds of miles downstream.

- The overall US mindset (there are definitely exceptions!) has changed over the 20th and early 21st century from one of maximizing tangible accomplishment, to maximizing financial gain and minimizing loss. We're playing musical chairs instead of making more chairs.

- Mass media (Disney -- kid shows, superhero movies) creates the impression that the current geographic and cultural structure of society is the only possible structure of society, by making a few views seem ubiquitous, and everything else the domain of pure fantasy.

- Prior attempts eventually got ridiculed, like EPCOT (ironically enough also Disney). People won't leave you alone -- they'll insist that any hope of new ideas is unforgivable hubris, and do whatever they can to make their ridicule a self-fulfilling prophecy.