Fourth and Madison Building

Coordinates: 47°36′20″N 122°19′59″W / 47.605498°N 122.333032°W / 47.605498; -122.333032
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Fourth and Madison Building
Fourth and Madison Building is located in Seattle WA Downtown
Fourth and Madison Building
Location within downtown Seattle
Former namesIDX Tower
General information
TypeCommercial offices
Location925 Fourth Avenue
Seattle, Washington
Coordinates47°36′20″N 122°19′59″W / 47.605498°N 122.333032°W / 47.605498; -122.333032
Construction started2000
Roof156.06 m (512.0 ft)
Technical details
Floor countAbove ground: 40
Below ground: 2
Floor area845,000 sq ft (78,500 m2)
Design and construction
Architect(s)Zimmer Gunsul Frasca Partnership
DeveloperHines Interests Limited Partnership
Structural engineerMagnusson Klemencic Associates
Main contractorPCL Construction

The Fourth and Madison Building (formerly the IDX Tower) is a 40-story skyscraper in downtown Seattle, Washington.[5] The building is located at 925 Fourth Avenue, at the intersection with Madison Street. Upon its completion in 2002, the late-modernist highrise was Seattle's first building to exceed 500 ft (150 m) in over a decade.

In 2007, Fourth and Madison was awarded the BOMA International Office Building of the Year Award in the 500,000–1,000,000 sq ft (46,000–93,000 m2) category.[6]

The rooftop garden on the seventh floor is a privately owned public open space (POPOS).[7]

Construction of the foundation required shoring around the Great Northern Tunnel and Downtown Seattle Transit Tunnel. The tower also cantilevers 12 feet (3.7 m) over the Downtown YMCA.[8]


  1. ^ "Fourth and Madison Building". CTBUH Skyscraper Center.
  2. ^ "Emporis building ID 100522". Emporis. Archived from the original on March 5, 2016.
  3. ^ "Fourth and Madison Building". SkyscraperPage.
  4. ^ Fourth and Madison Building at Structurae
  5. ^ "Hines Corp. press release". 2002-12-04. Archived from the original on 2007-09-28. Retrieved 2007-07-31.
  6. ^ "Press release: Fourteen North American Commercial Properties Win The Office Building of the Year (TOBY) and Earth Awards". BOMA. 2007-08-01. Archived from the original on 2010-12-22. Retrieved 2009-11-26.
  7. ^ "Privately Owned Public Open Spaces (POPOS)". Seattle City Council. Retrieved 2012-09-25.
  8. ^ Loesch, E. Douglas (October 3, 2002). "IDX Tower: Uncommon site poses steep challenges". Seattle Daily Journal of Commerce. Retrieved September 14, 2016.

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