DocomomoJoin
  • Explore Modern
    • Explore the register
    • Designers
    • Styles of the Modern Era
    • Resources
  • Latest News
  • Events
    • Upcoming events
    • Modernism in America Awards
    • National Symposium
    • Tour Day
  • Support
    • Donate
    • Membership
    • Theodore Prudon Fund
    • Why become a member
    • Members & Supporters
  • Engage
    • About
    • Regional chapters
    • Start a chapter
    • Submit a site you love
    • Get involved
  • Search
  • Explore Modern
  • Register

Climate Pledge Arena

Century 21 - Washington State Coliseum
Excellent
  • Identity of Building/Site

Climate Pledge Arena

A nighttime view of the completed Climate Pledge Arena - 2023. 

Credit

Courtesy of Populous

Site overview

Awards

Design

Citation of Merit

Civic

2023

The jury awards a Civic/Institutional Design Citation of Merit for the restoration of Climate Pledge Arena. This historic arena, originally the Century 21 - Washington State Coliseum, played a pivotal role during the 1962 Century 21 Exposition. Designed by Paul Thiry, it showcased innovative architectural feats, including its massive clear-span structure and distinctive glass curtain walls. Over time, the arena faced obsolescence, but it was saved through creative adaptive reuse. To accommodate modern needs, a new atrium lobby and entrance plaza were constructed on the south side, offering a transparent and visually minimal addition. The interior was completely reimagined, with the event floor lowered and a regulation-size arena installed. Notably, the historic concrete buttresses, perimeter piers and glass curtain wall were preserved during excavation and construction. The project adhered to the Secretary of the Interior's Standards for Rehabilitation, utilizing federal tax credits. Today, Climate Pledge Arena stands as one of the largest and most iconic structures from the Century 21 Exposition, retaining its distinctive profile and serving as a prominent landmark in Seattle. 

“This is a building typology that we lose over and over again. While some of them perhaps should be lost, this one absolutely deserves to remain. They did an incredible job, now all that’s left is to bring back the Sonics.”

- Mark Lamster, 2023 Jury member
Client

Oak View Group

Restoration Team

Architect of Record: Populous; General Contractor: Mortenson; Structural Engineer: Thornton Tomasetti; Preservation Consultant: Historic Resources Group; Local Architect: DLR Group; MEP Engineer: ME Engineers; Landscape Architect: Swift Company; Owner’s Representative/Project Manager: CAA ICON

How to Visit

The arena hosts concerts, sports games, and family-friendly events.

Location

Climate Pledge Arena

334 1st Ave N
Seattle, WA, 98109
More visitation information

Case Study House No. 21

Lorem ipsum dolor

A nighttime view of the completed Climate Pledge Arena - 2023. 

Credit:

Courtesy of Populous

Related chapter

Western Washington

About
  • Docomomo US
  • US Board of Directors
  • Partner Organizations
  • Terms of Use
  • Site Credits
  • Contact
Membership
  • Membership Overview
  • Why you should become a member
  • Join
  • Members & Supporters

© Copyright 2025 Docomomo US

Donate

Donations keep vital architecture alive and help save threatened sites around the country. Docomomo US relies on your donations to raise awareness of modern design and advocate for threatened sites. Donate today ›