Architecture09/24/2026@BuildDesk
The Athletics Break Ground on Their Las Vegas Ballpark
AthleticsEast Tropicana Avenue, Paradise, Nevada 89158, United States
Starts 06/23/2025 3:00PMCONFIRMED 85% CONFIDENCE1.3 years agoNews 3: 'The Athletics held a groundbreaking ceremony Monday morning' (23 June 2025); the Review-Journal^[5] had the ceremony 'scheduled to occur at 8 a.m. on June 23' (PDT, 15:00Z).
Owner John Fisher, MLB commissioner Rob Manfred and Nevada officials broke ground on the $1.75 billion, 33,000-capacity ballpark on the former Tropicana site at the south end of the Strip, which the A's plan to open for the 2028 season.
$1.8B
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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 01/01/2028ESTIMATED 50% 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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Architecture09/14/2026@BuildDesk
The Astrodome Opens as the World's First Domed Stadium
NRG Astrodome, NRG Parkway, Houston, Texas
Starts 04/09/1965CONFIRMED 87% 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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LAX's Terminal 4 Modernization Tops Out
Terminal 4, World Way, Westchester, Los Angeles, CA 90245Los Angeles World Airports
Starts 05/13/2026ESTIMATED 60% CONFIDENCE134 days agoLAWA's^[1][2] release of Wednesday, May 13, 2026 says "This week, crews lifted and placed the final steel beam upon the terminal's new frame" without naming the day, so the pin takes the release date.
Crews placed the final steel beam on the frame of American Airlines' rebuilt Terminal 4 main concourse at LAX, finishing the major structural work before interiors go in.
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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 09/08/2020CONFIRMED 82% 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
0.66
Sports09/15/2026@BuildDesk
Las Vegas' $1.9BN Mega Stadium
3333 Al Davis Way, Las Vegas, Nevada, United StatesLas Vegas Raiders
Starts 07/31/2020CONFIRMED 89% CONFIDENCE6.1 years agoHappened as dated, per the source^[1]: "On July 31, 2020, Allegiant Stadium opened its doors for Las Vegas Raiders fans for the team’s first game on home turf."
The Las Vegas Raiders open Allegiant Stadium, a 65,000-seat, climate-controlled venue with a retractable end-zone wall built in three years and nine months on the Las Vegas Strip.
$1.9B
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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 04/01/2026CONFIRMED 90% CONFIDENCE176 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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Sports09/15/2026@BuildDesk
The First Las Vegas Grand Prix Races Down the Strip
Koval Lane, Paradise, Clark County, Nevada, United StatesFormula 1
Starts 11/18/2023CONFIRMED 90% CONFIDENCE2.8 years agoHappened as dated, per the source^[1]: the 2023 Las Vegas Grand Prix was run as "the first running of the Las Vegas Grand Prix" with a historic 10pm lights-out start.
Formula 1 held its first Las Vegas Grand Prix after builders threw up a purpose-built paddock and resurfaced dozens of miles of Strip-area roads to track-grade tolerances in under a year.
$80M
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Architecture09/20/2026@BuildDesk
Cosm's LED Dome Opens as Centennial Yards' First Venue
125 Ted Turner Drive SW, Atlanta, GA 30303Cosm
Starts 06/10/2026CONFIRMED 90% CONFIDENCE106 days agoCosm's^[1] own construction update announced that the Atlanta venue "will debut for the public on June 10", and Atlanta News First reported from the opening that day.
Cosm opened a 70,000-square-foot, three-level venue built around an 87-foot 12K LED dome in Atlanta's Gulch, showing Game 4 of the NBA Finals on its first night. It is the first attraction finished inside Centennial Yards, the $5 billion, 50-acre redevelopment of the rail gulch between State Farm Arena and Mercedes-Benz Stadium.
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Sports09/15/2026@BuildDesk
Phoenix Hill Sports Park Opens in Chengdu
Jinniu District, Chengdu, Sichuan, China
Starts 06/01/2022ESTIMATED 66% CONFIDENCE4.3 years agoHappened as dated, per the source^[1]: "constructed between 2010 and 2021 and officially opened in 2022."
Chengdu opened Phoenix Hill Sports Park, a stadium-and-arena complex built for international sporting events, after more than a decade of construction.
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Construction Starts on Diriyah's 20,000-Seat Arena Superblock
Diriyah CompanyDiriyah, Riyadh, Saudi Arabia
Starts 07/16/2025CONFIRMED 90% CONFIDENCE1.2 years agoDiriyah Company^[1] dated its announcement of the "SAR 5.75 billion ($1.53 billion)" Arena Superblock contract 16 July 2025.
Diriyah Company awarded a branch of China Harbour Engineering the contract to build the Arena Superblock: the multi-purpose indoor Diriyah Arena seating 20,000 spectators, three mixed-use office buildings and a parking facility with more than 4,000 spaces. The arena sits on the edge of historic At-Turaif and anchors the Grand Avenue district alongside Diriyah's Grand Mosque.
SAR 5.8B
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Montreal's Olympic Stadium Roof Targeted to Reopen in 2028
Stade olympique, 4545 Avenue Pierre-De Coubertin, Montreal, Quebec, Canada
Starts 12/31/2028SCHEDULED 80% CONFIDENCEin 2.3 yearsGiven as scheduled, per the source^[1]: "expected to be completed by 2028".
Quebec is replacing the perpetually troubled retractable roof of Montreal’s 1976 Olympic Stadium with a new fixed structure, targeting a 2028 reopening.
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The Review-Journal^[1][2]: 'The first steel roof truss was installed early Monday' and 'The June 1 milestone has been on the construction calendar for months'.

Start: Jun 1, 202690% CONFIDENCEfrom the source

Crews Raise the First Roof Truss on the A's Las Vegas Ballpark

A 200-ton steel truss was attached to a buttress on the east side of the ballpark on 1 June, the first piece of the arching roof that will top out about 290 feet over the field, roughly the height of the MGM Grand across Tropicana Avenue.

The first steel roof truss, about 200 tons, was attached to a buttress on the east side of the $2 billion ballpark early on Monday 1 June 2026, on the day it had been scheduled for months^[1].
Six buttresses anchor the roof; the trusses are built on the ground, lifted by a 1,200-ton crane inside the stadium and two 600-ton cranes outside, and held on shoring towers until the arches are complete^[1].
A second truss was attached to the first the same day, and the other truss installations were to follow over four to five months^[1].
The first arch capped six months of planning and took 10 days to put in place; the tallest will span 700 feet^[3].
By May the A's had spent $400 million, with anticipated completion on 29 February 2028^[5]; the second arch was finished on 18 August^[2].

Notable features

Roof tops out about 290 feet over the playing field, about the height of the MGM Grand^[1].
Glass roof that cuts direct glare while letting indirect light in through north-facing clerestory windows^[4].
Trusses of 150 to 200 tons each, the heaviest 500 tons^[1].

@BuildDesk

References 583% CONFIDENCE

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

[1]90%
reviewjournal.com/sports/athletics/raise-the-roof-first-steel-truss-installed-on-as-ballpark-in-latest-project-milestone-3831873
reviewjournal.com· Posted Sep 24, 2026· Starts Jun 1, 2026 ✓· 26% of score
The Review-Journal^[2]: 'The first steel roof truss was installed early Monday' and 'The June 1 milestone has been on the construction calendar for months'.
[2]80%
Truss the process: 2nd A's Las Vegas ballpark roof arch installation complete
reviewjournal.com· Published Aug 18, 2026· 23% of score
The follow-up: the second steel truss arch was completed on 18 August; the middle truss, the stadium's highest point, is next.^[1]
[3]75%
A's $2 Billion Las Vegas Ballpark Shows Progress With First Roof Truss in Place
coyotecountrylv.com· Published Jun 16, 2026· 18% of score
The first arch capped six months of planning and took 10 days to install; the tallest arch will span 700 feet and rise 290 feet; first home games expected April 2028.^[1]
[4]85%
Grand tour: A's brass get a look at future home park in Las Vegas
mlb.com· Published Jun 13, 2026· 18% of score
MLB.com: the week of the tour 'marked the latest significant milestone with the raising of the first of six trusses that will make up the roof'; the park opens in 2028.
[5]80%
After $400M, new Athletics ballpark is on time, on budget
ballparkdigest.com· Published May 23, 2026· 16% of score
Before the lift: $400 million spent of $2 billion, four 200-foot shoring towers up, roof work to begin in June, anticipated completion 29 February 2028.^[1]

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Architecture09/24/2026@BuildDesk
The Athletics Break Ground on Their Las Vegas Ballpark
AthleticsEast Tropicana Avenue, Paradise, Nevada 89158, United States
Starts 06/23/2025 3:00PMCONFIRMED 85% CONFIDENCE1.3 years agoNews 3: 'The Athletics held a groundbreaking ceremony Monday morning' (23 June 2025); the Review-Journal^[5] had the ceremony 'scheduled to occur at 8 a.m. on June 23' (PDT, 15:00Z).
Owner John Fisher, MLB commissioner Rob Manfred and Nevada officials broke ground on the $1.75 billion, 33,000-capacity ballpark on the former Tropicana site at the south end of the Strip, which the A's plan to open for the 2028 season.
$1.8B
0.71
Sports09/20/2026@BuildDesk
The Athletics' Las Vegas Ballpark Opens on the Tropicana Site
3801 South Las Vegas Boulevard, Las Vegas, NVAthletics
Starts 01/01/2028ESTIMATED 50% 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
0.69
Architecture09/14/2026@BuildDesk
The Astrodome Opens as the World's First Domed Stadium
NRG Astrodome, NRG Parkway, Houston, Texas
Starts 04/09/1965CONFIRMED 87% 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.
0.67
Architecture09/24/2026@BuildDesk
LAX's Terminal 4 Modernization Tops Out
Terminal 4, World Way, Westchester, Los Angeles, CA 90245Los Angeles World Airports
Starts 05/13/2026ESTIMATED 60% CONFIDENCE134 days agoLAWA's^[1][2] release of Wednesday, May 13, 2026 says "This week, crews lifted and placed the final steel beam upon the terminal's new frame" without naming the day, so the pin takes the release date.
Crews placed the final steel beam on the frame of American Airlines' rebuilt Terminal 4 main concourse at LAX, finishing the major structural work before interiors go in.
0.67
Sports09/15/2026@BuildDesk
SoFi Stadium Opens in Inglewood With a Ribbon-Cutting
SoFi Stadium, 1001 Champion Drive, Inglewood, California, United States
Starts 09/08/2020CONFIRMED 82% 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
0.66
Sports09/15/2026@BuildDesk
Las Vegas' $1.9BN Mega Stadium
3333 Al Davis Way, Las Vegas, Nevada, United StatesLas Vegas Raiders
Starts 07/31/2020CONFIRMED 89% CONFIDENCE6.1 years agoHappened as dated, per the source^[1]: "On July 31, 2020, Allegiant Stadium opened its doors for Las Vegas Raiders fans for the team’s first game on home turf."
The Las Vegas Raiders open Allegiant Stadium, a 65,000-seat, climate-controlled venue with a retractable end-zone wall built in three years and nine months on the Las Vegas Strip.
$1.9B
0.66
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 04/01/2026CONFIRMED 90% CONFIDENCE176 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.
0.66
Sports09/15/2026@BuildDesk
The First Las Vegas Grand Prix Races Down the Strip
Koval Lane, Paradise, Clark County, Nevada, United StatesFormula 1
Starts 11/18/2023CONFIRMED 90% CONFIDENCE2.8 years agoHappened as dated, per the source^[1]: the 2023 Las Vegas Grand Prix was run as "the first running of the Las Vegas Grand Prix" with a historic 10pm lights-out start.
Formula 1 held its first Las Vegas Grand Prix after builders threw up a purpose-built paddock and resurfaced dozens of miles of Strip-area roads to track-grade tolerances in under a year.
$80M
0.64
Architecture09/20/2026@BuildDesk
Cosm's LED Dome Opens as Centennial Yards' First Venue
125 Ted Turner Drive SW, Atlanta, GA 30303Cosm
Starts 06/10/2026CONFIRMED 90% CONFIDENCE106 days agoCosm's^[1] own construction update announced that the Atlanta venue "will debut for the public on June 10", and Atlanta News First reported from the opening that day.
Cosm opened a 70,000-square-foot, three-level venue built around an 87-foot 12K LED dome in Atlanta's Gulch, showing Game 4 of the NBA Finals on its first night. It is the first attraction finished inside Centennial Yards, the $5 billion, 50-acre redevelopment of the rail gulch between State Farm Arena and Mercedes-Benz Stadium.
0.64
Sports09/15/2026@BuildDesk
Phoenix Hill Sports Park Opens in Chengdu
Jinniu District, Chengdu, Sichuan, China
Starts 06/01/2022ESTIMATED 66% CONFIDENCE4.3 years agoHappened as dated, per the source^[1]: "constructed between 2010 and 2021 and officially opened in 2022."
Chengdu opened Phoenix Hill Sports Park, a stadium-and-arena complex built for international sporting events, after more than a decade of construction.
0.63
Sports09/20/2026@BuildDesk
Construction Starts on Diriyah's 20,000-Seat Arena Superblock
Diriyah CompanyDiriyah, Riyadh, Saudi Arabia
Starts 07/16/2025CONFIRMED 90% CONFIDENCE1.2 years agoDiriyah Company^[1] dated its announcement of the "SAR 5.75 billion ($1.53 billion)" Arena Superblock contract 16 July 2025.
Diriyah Company awarded a branch of China Harbour Engineering the contract to build the Arena Superblock: the multi-purpose indoor Diriyah Arena seating 20,000 spectators, three mixed-use office buildings and a parking facility with more than 4,000 spaces. The arena sits on the edge of historic At-Turaif and anchors the Grand Avenue district alongside Diriyah's Grand Mosque.
SAR 5.8B
0.62
Architecture09/14/2026@BuildDesk
Montreal's Olympic Stadium Roof Targeted to Reopen in 2028
Stade olympique, 4545 Avenue Pierre-De Coubertin, Montreal, Quebec, Canada
Starts 12/31/2028SCHEDULED 80% CONFIDENCEin 2.3 yearsGiven as scheduled, per the source^[1]: "expected to be completed by 2028".
Quebec is replacing the perpetually troubled retractable roof of Montreal’s 1976 Olympic Stadium with a new fixed structure, targeting a 2028 reopening.
C$870M
0.62

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