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Rolf Pendall

@rpplan.bsky.social
507 followers 263 following 84 posts

I'm an urban planning educator at the University of Illinois, Urbana-Champaign. My questions/quests: Can zoning make communities equitable instead of protecting privilege? What narratives & political campaigns can lead to zoning for equity?

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Rolf Pendall @rpplan.bsky.social · 21/06/2025
BPJ 1994--Nonpoint source pollution: Getting to the nonpoint. Do site-by-site approaches to stormwater kill urban density? @kateontransport.bsky.social your post also makes me happy because you were such a great Building Resilient Regions co-conspirator. Thanks for this legacy. 2/2
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Rolf Pendall @rpplan.bsky.social · 21/06/2025
This makes me happy on so many levels--my first 2 sole-authored articles were in BPJ. 1993: Clavel & Forester--shall ever the twain meet? Little did I know they were already mixing it up at Cornell, that I'd join them there 5 years later, and that you'd be my RA a few years after that. 1/
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Rolf Pendall @rpplan.bsky.social · 02/06/2025
I’m kidding, mostly
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Rolf Pendall @rpplan.bsky.social · 02/06/2025
Next stop Phoenix. It’s a slippery slope…water flows uphill to money.
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Rolf Pendall @rpplan.bsky.social · 30/05/2025
2/2 In particular, LLMs tend to overgeneralize findings and implications in ways that the original authors tended to avoid, perhaps because they didn't have enough evidence to draw such conclusions.
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Rolf Pendall @rpplan.bsky.social · 30/05/2025
LLMs suck at lit review, and they're getting worse at it. Transparently obvious from today's news (HHS's nonsense MAHA report!) and backed with recently published peer-reviewed research by Peters & Chin-Yee: doi.org/10.1098/rsos...
Screen grab of article title and authors, "Generalization bias in large language model summarization of scientific research," Uwe Peters and Benjamin Chin-YeeAbstract: "Artificial intelligence chatbots driven by large language
models (LLMs) have the potential to increase public science
literacy and support scientific research, as they can quickly
summarize complex scientific information in accessible terms.
However, when summarizing scientific texts, LLMs may
omit details that limit the scope of research conclusions,
leading to generalizations of results broader than warranted
by the original study. We tested 10 prominent LLMs,
including ChatGPT-4o, ChatGPT-4.5, DeepSeek, LLaMA 3.3
70B, and Claude 3.7 Sonnet, comparing 4900 LLM-generated
summaries to their original scientific texts. Even when
explicitly prompted for accuracy, most LLMs produced
broader generalizations of scientific results than those in
the original texts, with DeepSeek, ChatGPT-4o, and LLaMA
3.3 70B overgeneralizing in 26–73% of cases. In a direct
comparison of LLM-generated and human-authored science
summaries, LLM summaries were nearly five times more
likely to contain broad generalizations (odds ratio = 4.85,
95% CI [3.06, 7.70], p < 0.001). Notably, newer models tended
to perform worse in generalization accuracy than earlier
ones. Our results indicate a strong bias in many widely
used LLMs towards overgeneralizing scientific conclusions,
posing a significant risk of large-scale misinterpretations
of research findings. We highlight potential mitigation
strategies, including lowering LLM temperature settings and
benchmarking LLMs for generalization accuracy."
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Rolf Pendall @rpplan.bsky.social · 28/05/2025
A little more precision and nuance would be nice to see. 2/2
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Rolf Pendall @rpplan.bsky.social · 28/05/2025
Can you please expand on what you mean by “skepticism of private development”? Also, you go from “urban planning” (a set of practices) to “planners”—which planners do you mean? Where? Which sectors? Professional planners work on all sides of development. 1/2
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Rolf Pendall @rpplan.bsky.social · 27/05/2025
2/2 Small suburbs in TX have often incorporated to avoid high density housing. This bill could reinforce such fragmentation and exclusionary HOA formation.
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Rolf Pendall @rpplan.bsky.social · 27/05/2025
Thanks for highlighting this bill. By my count, TX SB 15 will apply to about 16 cities total; it also applies only where HOAs don’t impose higher minimum lot sizes. In short, it could reinforce spatial inequality and/ or hasten gentrification.
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Rolf Pendall @rpplan.bsky.social · 24/05/2025
This atrocious trend in police killings is entirely driven by red states, as the chart shows. Police killings plateaued in blue states and then fell.
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Rolf Pendall @rpplan.bsky.social · 23/05/2025
5/5 How can we overcome the political unpopularity of broad-based taxes after 50+ years of concerted efforts to erode the sense that we're all in this together?
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Rolf Pendall @rpplan.bsky.social · 23/05/2025
4/ At least since Prop 13, property taxes have been undermined by state & local backlash, but demand for local public goods has grown. People want stuff but they won't pay for it, but they don't want other people to get stuff they aren't paying for.
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Rolf Pendall @rpplan.bsky.social · 23/05/2025
3/ But local fiscal systems are path-dependent and overdetermined by higher-level laws & constitutions (state or national, depending on the country). Has local property-tax dependence strengthened anywhere? How has that occurred? @cbgoodman.co -- examples?
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Rolf Pendall @rpplan.bsky.social · 23/05/2025
2/ "Many cities around the world can and should take more advantage of the broad-based land value capture mechanism already at its disposal, the property tax. Local efforts to raise revenue should focus on overcoming its political unpopularity instead of devising new more complicated programs."
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Rolf Pendall @rpplan.bsky.social · 23/05/2025
1/ Property taxes are the best value-capture mechanism, per Aurora Echevarria & @elpaavo.bsky.social based on intensive study of Mexico City. Excellent summary of their arguments on @urbanaffairsreview.bsky.social blog: www.urbanaffairsreview.com/uar-archive/...
urbanaffairsreview.com
Challenges to Equitable and Effective Land Value Capture: Lessons from Mexico City — Urban Affairs Review
Scholars and practitioners argue that local governments should capture rising land values to fund services and infrastructure, especially when the value results from public and collective action. Yet ...
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Rolf Pendall @rpplan.bsky.social · 12/05/2025
Ageism leads many people to conclude that older drivers are inherently unsafe. This misconception needs to be corrected, and framing needs to shift. S. Rosenbloom has written extensively about this; also see a recent JPL review by Alex Li journals.sagepub.com/doi/abs/10.1...
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Rolf Pendall @rpplan.bsky.social · 12/05/2025
You might want to update this; your data are from 2013-14 I think. Crashes among young drivers are way too high, but they've come down significantly thanks in part to evidence-based policymaking. apnews.com/article/youn...
apnews.com
Report: Young driver fatality rates have fallen sharply in the US, helped by education, technology
A new report says that crash and fatality rates among drivers under 21 have fallen dramatically in the U.S. during the past 20 years but young drivers are still the riskiest group behind the wheel.
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Rolf Pendall @rpplan.bsky.social · 07/05/2025
Indirectly related to the article: Spoils system vs. civil service figured in the assassination of James Garfield. Check it out on Throughline (a consistently great NPR podcast): www.npr.org/2025/04/24/1...
npr.org
The Deadly Story of the U.S. Civil Service : Throughline
When James Garfield won the Presidency in 1880, Charles Guiteau got ready to accept his new government job. No one had actually offered him a job – but he'd campaigned for Garfield, so he assumed he'd...
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Rolf Pendall @rpplan.bsky.social · 05/05/2025
Amazing and sobering work. Congratulations.
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Rolf Pendall @rpplan.bsky.social · 04/05/2025
Women leading the settlement house movement advocated for public toilets over 100 years ago. See Maureen Flanagan’s “Constructing the Patriarchal City” for examples of feminist urbanism of the early 1900s in London, Dublin, Toronto, & Chicago.
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Heather Hurlburt @natsecheather.bsky.social · 04/04/2025
I promised my friend @rpplan.bsky.social that I would activate my account here to share my thoughts about the larger economic, political and global aspirations behind the tariffs, written for @chathamhouse.org www.chathamhouse.org/2025/04/trum...
chathamhouse.org
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Rolf Pendall @rpplan.bsky.social · 03/04/2025
This is so wrong. I admire your restrained tone. Thank you for starting the work, and best wishes finding alternative funding sources.
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Rolf Pendall @rpplan.bsky.social · 17/03/2025
Interesting reading. What implications for housing policy? Households are aging and shrinking but it’s expensive to adapt the stock. Would it be cost-effective to socialize costs of retrofits for energy efficiency, health, & safety?
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Yonah Freemark @yonahfreemark.com · 13/03/2025
New data tool launch today 🚨 @urbaninstitute.bsky.social's Federal Infrastructure site. It includes detailed information on funds from 110 programs across all states, counties & metro areas. Tool pinpoints the support that communities receive for transportation, housing, energy, water & broadband.
apps.urban.org
Are Federal Infrastructure Dollars Meeting Your Community’s Needs?
Data analysis tracking whether the billions in funding that the US has committed to its roads, bridges, housing, and other infrastructure are getting to the communities that need it most.
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Ida Bae Wells @nhannahjones.bsky.social · 11/03/2025
Please, please, if you report on this: the mandate to affirmatively further fair housing is literally codified in the Fair Housing Act of 1968 and neither Trump nor HUD can “repeal” this law. The rule defined how to enforce the law, but the law and obligation remain. www.yahoo.com/news/hud-sec...
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Rolf Pendall @rpplan.bsky.social · 11/03/2025
OK, I guess we'll have to agree to disagree.
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Rolf Pendall @rpplan.bsky.social · 11/03/2025
Hypothetical: would you characterize a 15% IZ mandate (without additional public subsidy) adopted simultaneously with a 30% upzoning and a new transit station as "unfunded"?
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Rolf Pendall @rpplan.bsky.social · 11/03/2025
Even if every tool could be a weapon, that doesn't mean we should ban every tool because of potential abuses, right? Do you support banning IZ or regulating it? Either way, the tool users are motivated to exclude by all means necessary and will find some other way to block housing.
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Rolf Pendall @rpplan.bsky.social · 11/03/2025
This makes sense, but there's an unfortunate tendency to extrapolate from California to everywhere else. Also, folx at one national think tank are broadcasting anti-IZ perspectives as part of a narrative that all land-use regulation is harmful.
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Rolf Pendall @rpplan.bsky.social · 10/03/2025
The federal government, funded by a progressive income tax, used to pay >50% of infrastructure costs for new growth, including public housing. IZ, like impact fees and other exactions, responds logically (politically) to the withdrawal of federal support.
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Rolf Pendall @rpplan.bsky.social · 10/03/2025
People used to attack impact fees for (other) infrastructure on the same grounds. Altshuler & Gomez-Ibanez responded in "Regulation for Revenue" (1993) that the counterfactual might be development moratoria. It might also be massive downzoning.
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Rolf Pendall @rpplan.bsky.social · 10/03/2025
New Jersey wouldn't have nearly as many suburban townhouses if it weren't for the Mt. Laurel builders' remedy. Maybe the market-rate units subsidize the affordable ones; but the market-rate folks also have affordable housing residents to thank for their opportunity to live there in the first place.
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Rolf Pendall @rpplan.bsky.social · 10/03/2025
I'm seeing an uptick in the anti-inclusionary zoning narrative from an econ 101 standpoint, which assumes a questionable counterfactual (upzoning could occur without IZ). In many places, IZ is the political cost of upzoning.
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Rolf Pendall @rpplan.bsky.social · 14/02/2025
This is also filtering at work, right? New houses for working & middle class white people in the burbs, quality decline in older neighborhoods with surplus housing. Not “put all the poor families in one place” but “keep Black families out of new postwar places.”
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Rolf Pendall @rpplan.bsky.social · 08/02/2025
Jamie Loftus’s podcast Sixteenth Minute of Fame had a good sequence of episodes about the manosphere late last year (2024).
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Rolf Pendall @rpplan.bsky.social · 04/02/2025
It’s long. For class, You might want to check out her related 1996 article on Chicago: doi.org/10.1177/0096...
doi.org
Sage Journals: Discover world-class research
Subscription and open access journals from Sage, the world's leading independent academic publisher.
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Rolf Pendall @rpplan.bsky.social · 04/02/2025
It’s older than neoliberalism. Gender analysis clarifies that it’s also about misogyny and gynophobia. Recommend this book by Maureen Flanagan—Constructing the Patriarchal City: Gender and the Built Environments of London, Dublin, Toronto, and Chicago, 1870s Into the 1940s.
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Rolf Pendall @rpplan.bsky.social · 02/02/2025
Insights from @timothysnyder.bsky.social about the ongoing coup and how patriots (i.e., those who believe in the rule of law) can counter it. The Logic of Destruction open.substack.com/pub/snyder/p...
open.substack.com
The Logic of Destruction
And how to resist it
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Rolf Pendall @rpplan.bsky.social · 29/01/2025
Ouch. So important to have this analysis. Sorry about the pause—hope it’s lifted soon.
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Rolf Pendall @rpplan.bsky.social · 28/01/2025
I like @timothysnyder.bsky.social's "people's cabinet" better for a name.
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Rolf Pendall @rpplan.bsky.social · 28/01/2025
Whom would you choose as the Dems’ shadow Secretaries of HUD, DOT, EPA, USDA, Treasury, HHS, Education, or any other agency? @timothysnyder.bsky.social has a good summary of this brilliant idea here: snyder.substack.com/p/shadow-cab...
snyder.substack.com
Shadow Cabinet
A Positive Form of Opposition
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Rolf Pendall @rpplan.bsky.social · 22/01/2025
Discouraging. I’m also wondering about the purple line in MD.
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Rolf Pendall @rpplan.bsky.social · 20/01/2025
I bet @gelbard.ca might have some recs for you.
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Rolf Pendall @rpplan.bsky.social · 19/01/2025
Nice that the Champaign Park District has the equipment to plow the path at Hessel Park but it’s only safe to get there in a car. OTOH at least the streets are a mile wide and plowed curb to curb so peds can say to heck with the sidewalk
Somewhat plowed concrete path in Hessel Park, Champaign IL
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Rolf Pendall @rpplan.bsky.social · 19/01/2025
What drivers get | What walkers get, Champaign “in-town” edition, I.e., the area that’s supposed to be pedestrian-friendly
A wide street plowed and salted ready for 40mph in a 30mph zone that should be 20mphAn icy slushy sidewalk with ample evidence of frequent pedestrian traffic
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Rolf Pendall @rpplan.bsky.social · 17/01/2025
Excellent recap by @sara-mctarnaghan.bsky.social on Treasury’s analysis of homeowner insurance: harder to get and more expensive.
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Rolf Pendall @rpplan.bsky.social · 17/01/2025
Lucky you! And smart, hardworking, and furbo.
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Rolf Pendall @rpplan.bsky.social · 17/01/2025
La rossa, La grassa, La dotta ftw! My favorite city in Italy and top five in the world.
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Rolf Pendall @rpplan.bsky.social · 06/01/2025
Unfortunately, too many condo owners act like they live in apartments. They won’t serve on the board and often ignore meetings. Many also won’t raise dues enough to fund adequate reserves. Free rider issues.
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