It's the first sentence in the History section
[1] Baldassari, Erin; Solomon, Molly (October 5, 2020). "The Racist History of Single-Family Home Zoning". NPR. Archived from the original on November 14, 2020. https://web.archive.org/web/20201114004918/https://www.kqed....
[3] Hansen, Louis (March 1, 2021). "Is this the end of single-family zoning in the Bay Area? San Jose, Berkeley, other cities consider sweeping changes". San Jose Mercury News. https://www.mercurynews.com/2021/03/01/is-this-the-end-of-si...
[4] Ruggiero, Angela (February 24, 2021). "Berkeley to end single-family residential zoning, citing racist ties". San Jose Mercury News. https://www.mercurynews.com/2021/02/24/berkeley-to-end-singl...
[5] Yelimeli, Supriya (February 24, 2021). "Berkeley denounces racist history of single-family zoning, begins 2-year process to change general plan - Council unanimously approved a resolution that will work toward banning single-family zoning". Berkeleyside. https://web.archive.org/web/20210301140957/https://www.berke...
[8] Baldassari, Erin (March 13, 2021). "Facing Housing Crunch, California Cities Rethink Single-Family Neighborhoods". NPR. Archived from the original on March 31, 2021. https://web.archive.org/web/20210331194917/https://www.npr.o...
https://economics21.org/history-zoning-america-flexible-hous...
Looks to me like another example of HN guy pushing a narrative and pretending it’s fact. Or maybe someone just made a mistake and a more charitable reading would show that there is perhaps not a conspiracy going on but instead just a misunderstanding.
She's the one quoted in the LA Times article: https://www.latimes.com/business/story/2020-01-19/single-fam...
Full disclosure, I was so impressed with Prof. Hirt's book that I wrote her Wikipedia page.
TLDR: the real estate developer that founded Claremont (Mason-McDuffie Co spearheaded by Duncan McDuffie) imposed conditions in its titles that explicitly bared non-whites and prohibited commercial enterprises. However, those title conditions couldn't control neighboring areas, so McDuffie pushed to get zoning laws passed that were explicitly inspired by anti-chinese laundry regulations in LA. The Berkley regulation was "expedited" to prevent a "negro dance hall" from opening.
To me, the existence of the anti-commercial provisions in the McDuffie title restrictions in addition to explicit racial exclusions indicates that racial exclusion was not the only motivating factor in adopting single family zoning laws. However, the context and immediate usage does make it pretty clear that racial exclusion was a significant part of the motivation.
See how activists say policing was invented to catch slaves or some ridiculous claim. There’s a bunch of others.
The history is there, it is what it is, as ridiculous as that is. You might argue that modern police have far outgrown their origins, and then it would be up to readers to decide which whether your claim is also ridiculous, given how many police departments generally exhibit qualities consonant with their origins.
I've yet to see a good counter-example.