Lighthaven (Event Venue)
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---
title: "Lighthaven (Event Venue)"
description: A ~30,000 sq. ft. conference venue and campus in Berkeley, California, operated by Lightcone Infrastructure as key infrastructure for rationality, AI safety, and progress communities
importance: 25
lastEdited: "2026-02-01"
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quality: 40
llmSummary: Lighthaven is a Berkeley conference venue operated by Lightcone Infrastructure that serves as physical infrastructure for AI safety, rationality, and EA communities. While well-documented as a facility, it represents supporting infrastructure rather than core AI safety research or strategy.
clusters:
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subcategory: community-building
entityType: organization
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import {EntityLink, KeyPeople, KeyQuestions, Section} from '@components/wiki';
## Quick Assessment
| Aspect | Details |
|--------|---------|
| **Type** | Conference venue and campus |
| **Location** | 2740 Telegraph Ave, Berkeley, CA 94705 |
| **Size** | ≈30,000 sq. ft. across 5-7 buildings |
| **Capacity** | 50-600 people (conferences), up to 80 lodging |
| **Operator** | Lightcone Infrastructure |
| **Established** | 2023 (formerly Rose Garden Inn) |
| **Key Communities** | Rationality, AI safety, Effective Altruism, progress studies |
| **Major Events** | MATS, <EntityLink id="E545">Manifest</EntityLink>, LessOnline, Progress Conference, EAGxBerkeley |
| **Accessibility** | Does not meet ADA standards for wheelchairs[^1] |
## Key Links
| Source | Link |
|--------|------|
| Official Website | [complexsystemspodcast.com](https://www.complexsystemspodcast.com/episodes/bits-and-bricks-oliver-habryka/) |
| Wikipedia | [en.wikipedia.org](https://en.wikipedia.org/wiki/South_Haven_Light) |
| LessWrong | [lesswrong.com](https://www.lesswrong.com/posts/Bxv69g6MKhdEzoxTh/the-deep-lore-of-lighthaven-with-oliver-habryka-tbc-episode) |
## Overview
Lighthaven is a distinctive conference campus in downtown Berkeley, California, operated by Lightcone Infrastructure since 2023 to serve as physical infrastructure for communities focused on improving humanity's <EntityLink id="E194">long-term trajectory</EntityLink>.[^2][^3] The venue consists of a cluster of old homes formerly known as the Rose Garden Inn, with approximately 30,000 square feet of space across multiple buildings surrounding gardens and courtyards.[^4][^5]
The campus is designed to optimize for casual conversations and serendipitous interactions rather than formal conference presentations. With lounge areas, nooks, gardens, and what one attendee described as "fractal geometry of a hotel," the venue creates natural gathering spots that facilitate the "hallway track" networking that many consider the most valuable part of conferences.[^6][^7] An attendee at Manifest described it as "rambly and wondrous and fun without being pretentious... like an incredibly-well-executed, 11-of-10 house party venue crossed with Disneyland."[^2][^4]
Lighthaven serves as key infrastructure for the rationality, AI safety, and Effective Altruism communities, hosting major events like MATS (ML Alignment & Theory Scholars program), Manifest, LessOnline, and Progress Conference, as well as smaller team retreats and researcher programs.[^2][^3][^8] The venue offers 20+ session spaces, accommodations for up to 80 people across approximately 45 bedrooms, and can handle conferences ranging from 50 to 600 attendees.[^2][^9]
## History
The site that became Lighthaven was originally the Rose Garden Inn, a historic hotel cluster in downtown Berkeley. The venue was discovered around 2014 when the <EntityLink id="E518">Center for Applied Rationality</EntityLink> (CFAR) used it for workshops on rationality and cognitive science.[^6][^10] Oliver Habryka, who runs Lightcone Infrastructure, described encountering the property through these early CFAR events and recognizing its unique potential.
Lightcone Infrastructure purchased the property and undertook renovations to transform it from a conventional hotel into purpose-built infrastructure for intellectual communities. The venue was formally rebranded as Lighthaven and opened in 2023.[^2][^3][^11] Unlike typical conference centers or university campuses with uniform layouts, Lighthaven preserved the "organic accretion" of the original hotel complex, which Habryka describes as having evolved through a kind of natural growth rather than top-down architectural planning.[^6]
The conversion process faced challenges related to Berkeley building codes and regulations. Habryka has discussed in podcasts how regulatory constraints imposed compromises on the design, including limitations on permitted activities that affected the final configuration of spaces.[^6] Despite these constraints, the team maintained the rambling, multi-building structure that creates unexpected encounters between attendees.
By 2024, Lighthaven had established itself as a core venue for the rationality and AI safety communities, hosting multiple major annual conferences and serving as a hub for researcher programs focused on existential risk and alignment work.[^2][^3][^8]
## Buildings and Spaces
Lighthaven's campus consists of multiple distinct buildings, each with different characteristics and uses:[^9][^12]
**The Atrium** contains common spaces upstairs along with 7 bedrooms, while the downstairs area is reserved for parties and conferences (typically not available on weekdays). This building serves as one of the primary social hubs of the campus.
**Bayes House** is among the larger spaces, featuring 9 bedrooms and a session room that can accommodate up to 60 people. The building is surrounded by gardens with capacity for 200+ people for outdoor plenaries and gatherings.[^9][^12]
**The Cottage** primarily houses storage and laundry facilities, with 4 bedrooms available for guests.[^9]
**The Den** offers 7 front-facing offices and event spaces, plus 4 more secluded bedrooms in the back, providing options for both collaborative work and quiet accommodation.[^9]
**The Extension** includes 4 small spaces that can serve as either meeting rooms or bedrooms, along with a gym and a 60-person capacity event space.[^9]
**The Farmhouse** provides additional common space with access to gardens and an outdoor bar area, serving as another natural gathering point.[^9]
**The Guesthouse**, located a block away from the main campus, adds 10 more bedrooms to the overall lodging capacity.[^9]
The campus also features multiple outdoor areas including gardens, an amphitheater, courtyards, and what attendees have described as a geodesic dome, along with various porches and transitional spaces designed to facilitate conversation.[^4][^13]
## Events and Community Use
Lighthaven has become the primary venue for several major recurring conferences and programs in the rationality, AI safety, and progress communities.
### Major Annual Events
**Progress Conference** has emerged as one of the venue's signature events, hosted by the Roots of Progress Institute. The 2025 conference, held October 16-19, attracted over 350 attendees and was described by many participants as "the best conference they ever attended."[^14][^15] The event featured keynote speakers including <EntityLink id="E269">Sam Altman</EntityLink>, Tyler Cowen, Jason Crawford (the organizer), Kmele Foster, Michael Kratsios, Jennifer Pahlka, Santi Ruiz, Blake Scholl, Dan Wang, Derek Thompson, Sonja Trauss, Jeff Tsao, Corin Wagen, and Caleb Watney.[^14][^16] The conference included a VIP reception at Stripe's headquarters and utilized Lighthaven's garden auditorium for plenary sessions while encouraging substantial unstructured time for conversations.[^14][^15] The event returns to Lighthaven for 2026, scheduled for October 8-11.[^14]
Conference partners and sponsors for Progress Conference have included the Foundation for American Innovation (FAI), Institute for Humane Studies, Institute for Progress, Works in Progress, and Abundance Institute, with media sponsorship from Big Think.[^14][^16]
**MATS (ML Alignment & Theory Scholars)** is a recurring program that helps early-career researchers enter the <EntityLink id="E439">AI alignment</EntityLink> field, using Lighthaven as a base for intensive research work and collaboration.[^2][^3][^17]
**Manifest** and **LessOnline** are major annual gatherings for the rationality and forecasting communities, utilizing the full campus for multi-day events that blend structured sessions with extensive social time.[^2][^3][^18]
**EAGxBerkeley 2024**, held September 7-8, brought approximately 500 attendees focused on effective altruism cause areas including existential risks, with particular emphasis on serving the Bay Area and Western USA EA community.[^1][^19]
### Other Events and Programs
Beyond major conferences, Lighthaven hosts a diverse range of activities including workshops by the <EntityLink id="E202">Machine Intelligence Research Institute (MIRI)</EntityLink> and Topos Institute on AGI risks, team retreats for 15-80 people, community events and parties for 10-500 people, and ongoing researcher lodging programs.[^2][^17] The venue has also hosted events like Vitalist Bay in spring 2025 (an 8-week conference-commune-concert hybrid focused on longevity with 200+ speakers), the ILIAD Conference in August 2024 (theoretical AI alignment with ~100 researchers, with a second iteration ODYSSEY scheduled for August 25-29, 2025), and Metagame Conference planned for September 12-14, 2025 focused on game design and strategy.[^20][^21][^22]
The campus is explicitly marketed as infrastructure for "mission-aligned activities" to advance humanity's long-term future, with Lightcone Infrastructure prioritizing groups and programs over small meetups due to the fixed overhead of running such a large facility.[^9][^23]
## Operator and Key People
Lighthaven is operated by **Lightcone Infrastructure**, a nonprofit organization that evolved from the <EntityLink id="E538">LessWrong</EntityLink> team and focuses on building intellectual infrastructure for communities working on existential risk, AI safety, and rationality.[^2][^3][^24] Beyond running Lighthaven, Lightcone maintains the LessWrong forum and related online platforms.[^6][^24]
**Oliver Habryka** is the founder and primary leader of Lightcone Infrastructure, overseeing both the organization's online properties and physical venue operations.[^6][^9][^25] He has been described as the "Lighthaven boss" and has discussed the venue's design philosophy and operational challenges in multiple podcasts, including a detailed conversation on the Complex Systems Podcast with Patrick McKenzie where he explored how building codes and regulations shaped the final configuration of the space.[^6][^9]
Habryka emphasizes that Lighthaven's unique design—what he calls "fractal geometry" resulting from organic accretion—creates structural advantages for fostering unexpected collisions between attendees and enabling the kind of deep engagement that doesn't happen in more conventionally planned spaces.[^6][^26] This design philosophy reflects his broader vision for intellectual infrastructure that supports substantive discourse and collaboration on civilization-scale challenges.
The Lightcone team has been praised by donors and event attendees for "good taste," thoughtfulness, and care in creating spaces that serve the AI safety and rationality communities.[^24][^27]
## Funding and Economics
Lighthaven is funded through a combination of event hosting revenue and philanthropic donations. The venue charges external groups between \$500-2,000 per person for events, with costs covering catering, audiovisual equipment, and facility use.[^9][^23] For lodging, rooms are available at \$85-\$390 per night, with discounts for longer stays, and day passes are offered for those attending events without overnight accommodation.[^28]
Lightcone Infrastructure maintains an active fundraising presence on <EntityLink id="E547">Manifund</EntityLink>, where donations support building and running the campus, as well as funding mission-aligned programs and researcher support.[^24][^27] One notable Manifund donor contribution of \$50,000 was specifically highlighted for supporting Lighthaven's role in hosting AI safety events and enabling public discourse, with the donor praising Lightcone's team for their thoughtfulness and impact.[^24][^27]
The operational model is explicitly designed so that revenue from hosting external conferences and events helps subsidize "on-mission stuff" like researcher programs and community-building activities that might not generate revenue.[^9][^23] Lightcone offers preferential pricing for high-impact projects aligned with their mission of improving humanity's long-term trajectory.[^9][^12]
Event sponsorships provide additional financial support. For example, Progress Conference partners have included the Foundation for American Innovation, Institute for Humane Studies, Institute for Progress, Works in Progress, and Abundance Institute, though specific sponsorship amounts are not publicly detailed.[^14][^16]
No government grants or venture capital involvement has been mentioned in available sources. The financial model appears to rely primarily on self-sustaining operations through event revenue combined with targeted philanthropic support from donors aligned with the rationality, AI safety, and effective altruism communities.[^24][^27]
## Community Reception and Impact
Lighthaven has received overwhelmingly positive feedback from attendees and community members across multiple platforms including <EntityLink id="E538">LessWrong</EntityLink>, the Alignment Forum, EA Forum, and various Substack newsletters.
The venue is consistently praised for its design that facilitates organic conversations and networking. Attendees describe it as "perfect for mingling and deep conversations," with one noting it's "optimized for casual conversation" through features like readily available snacks, comfortable nooks, and a layout that naturally encourages prioritizing informal "hallway track" interactions over rigid session schedules.[^15][^29][^30] Multiple sources characterize it as a "structural accelerant for collisions between attendees" that enables serendipitous connections in ways that more conventional conference venues don't achieve.[^6]
Progress Conference attendees in particular offered enthusiastic assessments, with many calling it "the best conference ever" and describing the 2025 event as "energizing and inspiring."[^14][^15] One detailed report characterized the experience as a "huge 12-hour-a-day cocktail party" and praised the attention to operational details including high-quality buffet food, clear scheduling systems, and encouragement of self-organized sessions.[^15][^31]
The venue has been described as providing "life-changing events" for attendees due to the concentration of brilliant people and the late-night conversations that the space facilitates.[^32] Some community members credit Lighthaven-hosted events with inspiring major life decisions, including relocations and career changes.[^32]
Financial supporters on Manifund emphasize the venue's importance for AI safety infrastructure, with donors highlighting how Lighthaven enables more frequent and higher-quality events for the alignment community while also serving as a platform for important public discourse.[^24][^27] The Lightcone team behind the venue is consistently praised for "good taste, thoughtful planning, and genuine care" in creating the space.[^24]
The venue has become sufficiently central to Bay Area rationalist culture that some community discussions analyze whether people love Berkeley generally or specifically love Lighthaven, with the implication that the venue has become a defining feature of the local intellectual ecosystem.[^33]
## Criticisms and Limitations
While reception has been largely positive, several constraints and criticisms have been noted.
### Accessibility Issues
Lighthaven does not meet ADA (Americans with Disabilities Act) standards for wheelchair accessibility due to the age and structure of the buildings.[^1][^34] The venue operators note they handle accessibility requests on a case-by-case basis, but the fundamental architectural limitations of the converted hotel complex create barriers for people with physical mobility challenges.[^1][^34]
### Capacity Constraints
The largest indoor space at Lighthaven can accommodate approximately 60 people, which creates challenges for events with larger audiences.[^9][^23] For bigger conferences like Manifest, organizers have had to use video feeds to allow overflow attendees to participate in sessions happening in smaller rooms.[^9] While outdoor spaces like the gardens can handle 200+ people, weather dependence limits their utility for year-round programming.[^9][^12]
### Regulatory and Operational Challenges
Oliver Habryka has discussed how Berkeley's building codes and regulatory environment imposed compromises on the venue's design and operations.[^6] He notes that "the laws that we make very literally construct our built environment," and that there were "compromises that you had to make due to the combination of the law and Berkeley's level of resourcing slash level of competence in enforcing the law."[^6] These constraints affect what activities are permitted and require extensive vendor coordination for operations like catering.[^6]
The venue's complex layout—while praised for facilitating serendipitous encounters—can also present navigation challenges for first-time attendees, described by some as "a bewildering maze of passageways, meeting-rooms, sleeping quarters, gardens, and vines."[^35]
### Community Concentration Effects
Some community members have raised concerns about whether Lighthaven's success at creating exceptional conference experiences might inadvertently create unrealistic expectations for everyday community building in Berkeley.[^33] One LessWrong post discusses how people who move to Berkeley seeking similar levels of connection and intellectual engagement struggle to replicate the Lighthaven experience in regular life, potentially leading to disappointment and eventual relocation.[^33]
### Media Skepticism
Habryka has noted that some mainstream media coverage, including articles in The Guardian and New York Times, has expressed skepticism about the value of nonprofit conference venues like Lighthaven, questioning whether such infrastructure represents appropriate use of resources.[^6] However, this criticism appears relatively limited and hasn't substantially affected the venue's operations or community support.
## Key Uncertainties
Several aspects of Lighthaven's operations and future remain unclear based on available information:
- **Long-term financial sustainability**: While the venue generates revenue from events and receives philanthropic support, no detailed financial statements or long-term sustainability projections are publicly available. It remains uncertain whether the current model can indefinitely maintain the ~30,000 square foot campus without additional major donations.
- **Expansion plans**: No information is available about whether Lightcone Infrastructure plans to expand Lighthaven's physical capacity, develop additional venues, or remain focused on the current Berkeley location.
- **Impact metrics**: While attendee feedback is overwhelmingly positive, there are no publicly available quantitative metrics on Lighthaven's impact on AI safety research productivity, rationality community growth, or other mission-aligned outcomes that could help assess its effectiveness relative to other interventions.
- **Scalability and replication**: It's unclear whether the Lighthaven model could be successfully replicated in other geographic locations, or whether its success depends on proximity to the Bay Area's existing concentration of rationalist and AI safety communities.
- **Regulatory resolution**: The extent to which Berkeley's building code constraints continue to limit venue operations, and whether any efforts are underway to address these limitations, remains unclear from public sources.
- **Demand and booking patterns**: No information is available about booking rates, waiting lists, or whether demand substantially exceeds available capacity, which would inform questions about the need for additional similar infrastructure.
## Sources
[^1]: [EAGxBerkeley 2024 - Effective Altruism](https://www.effectivealtruism.org/ea-global/events/eagxberkeley-2024)
[^2]: [Lighthaven - LessWrong](https://www.lesswrong.com/w/lighthaven)
[^3]: [Lighthaven - Alignment Forum](https://www.alignmentforum.org/w/lighthaven)
[^4]: [Havens of Light at the Coming of the Dark - Dave Kasten Substack](https://davekasten.substack.com/p/havens-of-light-at-the-coming-of)
[^5]: [The Lighthaven Campus is Open for Bookings - LessWrong](https://www.lesswrong.com/posts/memqyjNCpeDrveayx/the-lighthaven-campus-is-open-for-bookings)
[^6]: [Bits and Bricks: Oliver Habryka - Complex Systems Podcast](https://www.complexsystemspodcast.com/episodes/bits-and-bricks-oliver-habryka/)
[^7]: [Progress Conference](https://rootsofprogress.org/conference/)
[^8]: [Report from Progress Conference 2025 - Misha Glouberman Substack](https://mishaglouberman.substack.com/p/report-from-progress-conference-2025)
[^9]: [The Lighthaven Campus is Open for Bookings - EA Forum](https://forum.effectivealtruism.org/posts/oP8YDDJtTGjnH8Nnj/the-lighthaven-campus-is-open-for-bookings)
[^10]: [Lightcone Infrastructure - Manifund](https://manifund.org/projects/lightcone-infrastructure)
[^11]: [Toss a bitcoin to your Lightcone - LessWrong](https://www.lesswrong.com/posts/eKGdCNdKjvTBG9i6y)
[^12]: [The Lighthaven Campus is Open for Bookings - LessWrong](https://www.lesswrong.com/posts/memqyjNCpeDrveayx/the-lighthaven-campus-is-open-for-bookings)
[^13]: [Every Bay Area Walled Compound - Dave Kasten Substack](https://davekasten.substack.com/p/every-bay-area-walled-compound)
[^14]: [Progress Conference - Roots of Progress](https://rootsofprogress.org/conference/)
[^15]: [Report from Progress Conference 2025 - Misha Glouberman](https://mishaglouberman.substack.com/p/report-from-progress-conference-2025)
[^16]: [Progress Conference 2025 - Foundation for American Innovation](https://www.thefai.org/events/progress-conference-2025)
[^17]: [Lighthaven.space](https://lighthaven.space)
[^18]: [LessOnline](https://less.online)
[^19]: [EAGxBerkeley 2024 - Bay Area Global Health](https://bayareaglobalhealth.org/event/eagxberkeley-2024/)
[^20]: [Vitalist Bay Recap - Freethink](https://www.freethink.com/biotech/vitalist-bay-recap)
[^21]: [ILIAD Conference](https://www.iliadconference.com)
[^22]: [Metagame Conference Prediction Market - Manifold](https://manifold.markets/RickiHeicklen/will-the-metagame-conference-take-p)
[^23]: [The Lighthaven Campus is Open for Bookings - EA Forum](https://forum.effectivealtruism.org/posts/oP8YDDJtTGjnH8Nnj/the-lighthaven-campus-is-open-for-bookings)
[^24]: [Lightcone Infrastructure - Manifund](https://manifund.org/projects/lightcone-infrastructure)
[^25]: [Podcast with Oli Habryka on LessWrong - LessWrong](https://www.lesswrong.com/posts/jBPNK4iREjZr36sDx/podcast-with-oli-habryka-on-lesswrong-lightcone)
[^26]: [Bits and Bricks: Oliver Habryka - Complex Systems Podcast](https://www.complexsystemspodcast.com/episodes/bits-and-bricks-oliver-habryka/)
[^27]: [Lightcone Infrastructure - Manifund](https://manifund.org/projects/lightcone-infrastructure)
[^28]: [Waypoint Lighthaven - Booking Information](https://www.waypoint.lighthaven.space)
[^29]: [Report from Progress Conference 2025 - Misha Glouberman](https://mishaglouberman.substack.com/p/report-from-progress-conference-2025)
[^30]: [The Lightcone is nothing without its people - LessWrong](https://www.lesswrong.com/posts/5n2ZQcbc7r4R8mvqc/the-lightcone-is-nothing-without-its-people)
[^31]: [Lighthaven.space](https://lighthaven.space)
[^32]: [Do You Love Berkeley or Do You Just Love Lighthaven? - LessWrong](https://www.lesswrong.com/posts/pvFmjmFdbytfieHL6/do-you-love-berkeley-or-do-you-just-love-lighthaven)
[^33]: [Do You Love Berkeley or Do You Just Love Lighthaven? - LessWrong](https://www.lesswrong.com/posts/pvFmjmFdbytfieHL6/do-you-love-berkeley-or-do-you-just-love-lighthaven)
[^34]: [EAGxBerkeley 2024 - Effective Altruism](https://www.effectivealtruism.org/ea-global/events/eagxberkeley-2024)
[^35]: [Scott Aaronson Blog Post](https://scottaaronson.blog/?p=8908)