What a surprise that this comment thread is full of software developers in HCOL areas anecdotally seeing prices rise faster than the national average!
I think it's actually 20% for the top 100 cities; but a total of 62.5% of the population actually live in cities (82% live in urban areas - due to increase to 89% by 2050)
https://www.nationalpopularvote.com/100-biggest-cities-have-...