Cosm's LED Dome Opens as Centennial Yards' First Venue

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• Sports09/20/2026@BuildDesk

  Foundation Work Begins on the Commanders' New Stadium at RFK

  2400 East Capitol Street SE, Washington, D.C. 20003, United StatesWashington Commanders

  

  Starts 04/01/2026CONFIRMED90% CONFIDENCE175 days agoThe article states "Work on foundational infrastructure began in April 2026, with groundbreaking scheduled for early 2027", giving the month but not the day.^[1]

  Work started on the foundational infrastructure for a 65,000-seat domed stadium on the old RFK Stadium site in southeast Washington, with the full groundbreaking held back to early 2027 and opening expected in 2030. The Commanders are putting up $2.7 billion towards a project projected at $3.8 billion; the District is spending $500 million on infrastructure and will own the building.

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• Architecture09/14/2026@BuildDesk

  The Astrodome Opens as the World's First Domed Stadium

  NRG Astrodome, NRG Parkway, Houston, Texas

  

  Starts 04/09/1965CONFIRMED87% CONFIDENCE61.5 years agoHappened as dated, per sabr.org^[3]: "April 9, 1965: Astros beat Yankees in first game inside the Houston Astrodome."

  The Houston Astrodome, the world's first fixed-roof, air-conditioned multipurpose stadium, opened on 9 April 1965 with an exhibition game between the Astros and Yankees — though it's stood closed and searching for a new use since 2008.

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• Architecture09/20/2026@BuildDesk

  Harvard Opens the First Phase of Its Enterprise Research Campus

  224 Western Avenue, Allston, Boston, MA 02134, United StatesHarvard University

  

  Starts 06/23/2026CONFIRMED90% CONFIDENCE92 days agoThe developers' release says they "were joined on June 23 by Mayor Michelle Wu" to celebrate the opening.^[1]

  Harvard, Tishman Speyer and Breakthrough Properties cut the ribbon on the first phase of the Enterprise Research Campus in Allston: two commercial laboratory buildings called OneMilestone, the 343-apartment Verra, the Atlas Hotel, Harvard's David Rubenstein Treehouse conference centre, 40,000 square feet of retail and more than two acres of public open space. It is the opening move on a 36-acre site, with a Phase B of labs, offices and housing still to be permitted.

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• Architecture09/20/2026@BuildDesk

  GRB Houston South Opens as the Convention District's First Phase

  GRB Houston South, Avenida de las Americas at Polk Street, Houston, TexasHouston First Corporation

  

  Starts 05/01/2028ESTIMATED50% CONFIDENCEin 1.6 yearsHouston First^[1] says the fully financed first phase is "on schedule to open in May 2028", a month rather than a day.

  A 700,000-square-foot building joined to the George R. Brown Convention Center, holding two exhibition halls, an atrium hall and the largest ballroom in Texas, plus a 100,000-square-foot pedestrian plaza linking it to the Toyota Center. Houston First financed this first phase of its $2 billion convention district transformation with about $1.38 billion of hotel occupancy tax and special revenue bonds.

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• Architecture09/15/2026@BuildDesk

  One Vanderbilt Opens Beside Grand Central

  1 Vanderbilt Avenue, Midtown Manhattan, New York, NY 10017SL Green Realty·…

  

  Starts 09/14/2020CONFIRMED82% CONFIDENCE6.0 years agoHappened as dated, per the source^[1]: "One Vanderbilt was formally opened with a ceremony three days later, on September 14."

  One Vanderbilt, a 1,401-foot supertall office tower beside Grand Central Terminal, formally opened in Midtown Manhattan.

  $3.3B

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• Sports09/15/2026@BuildDesk

  Intuit Dome, the Clippers' New Arena, Opens in Inglewood

  Intuit Dome, Inglewood, California, USALA Clippers

  

  Starts 08/15/2024CONFIRMED84% CONFIDENCE2.1 years agoHappened as dated, per the source^[1]: "opened on August 15, 2024".

  The Clippers' new $2BN Intuit Dome arena opened in Inglewood on August 15, 2024, giving the team its first standalone home after decades sharing a venue with the Lakers.

  $2B

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• Health09/20/2026@BuildDesk

  Mass General's Ragon Building Opens Its First Tower to Patients

  Cambridge Street at Blossom Street, Boston, MA 02114, United StatesMass General Brigham

  

  Starts 01/01/2028DELAYED12 months late40% CONFIDENCEin 1.3 yearsMass General Brigham's^[1] own page still describes "initial first side of the building opening in 2027", a year earlier than current reporting.

  The first of two connected towers in Mass General's Cambridge Street expansion takes its first patients, bringing 450 beds and 12 levels of operating, procedural and interventional space for the Corrigan Minehan Heart Center and the Mass General Cancer Center. Turner topped out the steel in February 2025; the second tower is not due until 2030.

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• Sports09/20/2026@BuildDesk

  Memorial Stadium Reopens at Seattle Center

  401 5th Ave N, Seattle, WA 98109Seattle Public Schools

  

  Starts 09/01/2027ESTIMATED50% CONFIDENCEin 343 daysSeattle Center's^[1] project page gives "completion planned for Fall 2027", a season rather than a day.

  Seattle Public Schools, the City of Seattle and the Kraken-backed One Roof Partnership are replacing the 1947 stadium with a rebuilt open-air venue for school sport, concerts and community events, keeping and reframing the Memorial Wall that honours 762 local students and alumni killed in the Second World War. It is funded with $110 million of public money plus roughly $30 million raised privately.

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• Architecture09/20/2026@BuildDesk

  Olympia Opens to the Public After Its Kensington Rebuild

  Olympia, Hammersmith Road, Kensington, London, EnglandYoo Capital

  

  Starts 06/15/2026CONFIRMED90% CONFIDENCE100 days agoOlympia's^[1] own press release, headed "The all-new Olympia opens", gives 15 June 2026 as the opening day of the transformed destination.

  The Grade II-listed west London exhibition halls reopened as a mixed-use district with rooftop restaurants, offices, two hotels and the 3,800-capacity British Airways ARC music venue, which launched the following night. The GBP 1.3 billion transformation, designed by Heatherwick Studio and SPPARC, opens the 14-acre site to the public for the first time in 140 years; the 1,575-seat British Airways Theatre follows in 2027.

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• Sports09/15/2026@BuildDesk

  SoFi Stadium Opens in Inglewood With a Ribbon-Cutting

  SoFi Stadium, 1001 Champion Drive, Inglewood, California, United States

  

  Starts 09/08/2020CONFIRMED82% CONFIDENCE6.0 years agoHappened as dated, per the source^[1]: "An official ribbon-cutting ceremony was hosted on September 8".

  The most expensive stadium ever built opened as the new home of the LA Rams and Chargers, with its first NFL game days later.

  $5.1B

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• Sports09/20/2026@BuildDesk

  The Athletics' Las Vegas Ballpark Opens on the Tropicana Site

  3801 South Las Vegas Boulevard, Las Vegas, NVAthletics

  

  Starts 01/01/2028ESTIMATED50% CONFIDENCEin 1.3 yearsThe club's own ballpark site promises only "opening in 2028," a year rather than a date.^[1]

  The 33,000-seat domed ballpark, designed by Bjarke Ingels Group and HNTB around one of the largest cable-glass windows in North America, is rising on a corner of the 35-acre site of the Tropicana Las Vegas, which was imploded in October 2024. Construction broke ground in June 2025 on a roughly $2 billion build that brings Major League Baseball to the Strip.

  $2B

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• Sports09/20/2026@BuildDesk

  Broncos Target the 2031 Season to Open Their Burnham Yard Stadium

  Burnham Yard, Denver, CODenver Broncos

  

  Starts 09/01/2031ESTIMATED50% CONFIDENCEin 4.9 yearsThe team's own stadium FAQ says "the targeted completion for a new stadium would be the 2031 NFL season aligned with the expiration of the Broncos' current lease at Empower Field at Mile High," naming a season rather than a date.^[1]

  Burnham Yard, a former rail yard less than a mile southeast of Empower Field at Mile High, is the Broncos' preferred site for a privately funded retractable-roof stadium anchoring a mixed-use district of parks, housing, shops and restaurants. The Walton-Penner ownership group is paying for the stadium itself, with Denver and Colorado covering surrounding public improvements.

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