Union Square (Seattle)

Union Square (Seattle)
Union Square

One- and Two-Union Square
Alternative names Zippo Building
General information
Type Commercial offices
Location 600 University St and 601 Union St
Seattle, Washington
Coordinates 47°36′37″N 122°19′59″W / 47.610294°N 122.33296°W / 47.610294; -122.33296Coordinates: 47°36′37″N 122°19′59″W / 47.610294°N 122.33296°W / 47.610294; -122.33296
Completed One Union Square: 1981
Two Union Square: 1989
Antenna spire Two Union Square: 243 m (797 ft)
Roof One Union Square: 139 m (456 ft)
Two Union Square: 226 m (741 ft)
Technical details
Floor count One Union Square: 36
Two Union Square: 56
Floor area Two Union Square: 1,126,400 sq ft (104,650 m2)
Design and construction
Owner Union Square LLC
Main contractor Hoffman Construction
Turner Construction
Architect TRA Architects
Structural engineer Skilling Ward Magnusson Barkshire

Union Square is a twin tower skyscraper complex at Sixth Avenue between Union and University Streets in downtown Seattle, Washington, adjacent to Freeway Park.


One Union Square

One Union Square is an aluminum clad 139 m (456 ft) skyscraper consisting of 36 floors. Construction of the building was completed in 1981.

Two Union Square

Construction on Two Union Square began in 1987 and was complete by 1989. The226 m (741 ft) building is the third tallest in the Seattle skyline. The Seattle-based architectural firm of Floyd Naramore, William Bain, Clifton Brady and Perry Johanson (NBBJ) designed the tower, which was dedicated on 26 July 1989. Two Union Square has 56 floors, 1,126,428 sq ft (104,648.6 m2) of rentable space, and an underground concourse connecting to the Seattle Hilton Hotel and shopping at Rainier Square.


  • Ajilon Finance
  • Apple Physical Therapy-Seattle
  • Arboretum Mortgage
  • Northwestern Mutual Financial Network
  • BlackRock Financial
  • Ater Wynne
  • Blakely Sokoloff Taylor & Zafman
  • Bush Strout & Kornfeld
  • Colliers International‎
  • Ederer Investment Company
  • Ellis Li & McKinstry‎
  • First Choice Health
  • Hagen Kurth Perman & Co‎
  • Homestreet Bank‎
  • Kelly Services‎
  • Flinn Ferguson
  • GreaterGood Network
  • Kibble & Prentice‎
  • Keever Capital
  • The Lyman Group
  • Lasher Holzapfel Sperry‎
  • Miller Nash LLP‎
  • Morgan Stanley Smith Barney
  • NBS Financial Services
  • The Otto Law Group, PLLC
  • Peterson Sullivan LLP
  • Prolumina
  • Reed McClure
  • Stafford Frey Cooper‎
  • Swedish Medical Group
  • Vectorform LLC
  • Wedbush Securities‎
  • Williams Kastner


Further reading

  • Aïtcin, Pierre-Claude (1998). High-performance Concrete (1st ed.). London: E & FN SPON. ISBN 0419192700. 

External links

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