I believe almost every State (if not all) have at least one planned "15 minutes city"; even Red States. California have two(2) main ones: San Francisco and Los Angeles. But what I found: these cities are not going to be built in the specific city they mentioned, but city adjacent. It is easier and cheaper for them to start from scratch. So they want city adjacent empty land. Then, using whatever means necessary, they will push the population to their 'Utopian cities'. BTW, they are not calling them "15 minutes cities" anymore they are calling them "smart cities" and other names, so beware. Search your city or County and find out if they have plans for a "smart city" or a model city to address Climate Crisis.

The following is a link for the 40 Global main "smart cities", but these are just the more prominent and biggest of all: https://www.c40.org/cities/

ps. These information is not meant to scare you, but to inform you. To make you aware, so we can fight back.