Union Square (Seattle)
|Alternative names||Zippo Building|
|Location||600 University Street and|
601 Union Street
|Completed||One Union Square: 1981|
Two Union Square: 1989
|Owner||Union Square LLC|
|Antenna spire||Two Union Square:|
797 ft (243 m)
|Roof||One Union Square:|
456 ft (139 m)
Two Union Square:
741 ft (226 m)
|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|
|Structural engineer||Magnusson Klemencic Associates|
|Main contractor||Hoffman Construction Company|
Union Square is a skyscraper complex at Sixth Avenue between Union and University Streets in Downtown Seattle, Washington, adjacent to Freeway Park. It consists of two skyscrapers built in the 1980s and primarily used for office space. The entire complex features a 1,100-stall parking garage, a courtyard, a retail plaza spanning three stories and an underground pedestrian concourse that connects with the Fifth Avenue Theater and Rainier Square. Both structures were awarded LEED certification in 2009 and eventually received LEED Platinum certification 6 years later as a result of reduced annual energy consumption by 40 percent through recent renovations. The entire complex is currently managed by Washington Holdings, a real estate firm also known as Union Square LLC which is based in Seattle.
One Union Square
One Union Square is an aluminum clad 456-foot (139 m) skyscraper consisting of 36 floors with 2 floors below ground. Construction of this class A office building was completed 38 years ago in 1981. It is the first office building in Seattle to house all life-support systems in one location. The architect of One Union Square was TRA.
Two Union Square
Construction on Two Union Square began in 1987 and was complete by 1989. When accounting for the tip of the flag pole, the 797-foot (243 m) building is the third-tallest building in the Seattle skyline. The Seattle-based architectural firm NBBJ designed the tower, which was dedicated on July 29, 1989. Two Union Square has 56 floors with 1,126,428 square feet (104,649 m2) of rentable space, and an underground concourse connecting to the Seattle Hilton Hotel  and shopping at Rainier Square. It is the first skyscraper to use 19,000 lbs/in.2 high-strength concrete.
- Ajilon Finance
- Allianz Global Corporate & Specialty
- Apex Companies, LLC
- Apple, Inc.
- Apple Physical Therapy-Seattle
- Arboretum Mortgage
- Ater Wynne
- BlackRock Financial
- Blakely Sokoloff Taylor & Zafman
- Bush Strout & Kornfeld
- Buy My Ride INC.
- Colliers International
- Ederer Investment Company
- Edge Asset Management
- EHI Real Estate Advisors, Inc.
- Ellis Li & McKinstry
- First Choice Health
- Flinn Ferguson
- GreaterGood Network
- Hagen Kurth Perman & Co
- HDR, Inc.
- Homestreet Bank
- Integra Realty Resources
- Jones Lang LaSalle
- Kaiser Permanente
- Keever Capital
- Kelly Services
- Kibble & Prentice
- Kidder Mathews
- Lasher Holzapfel Sperry & Ebberson
- The Lyman Group
- Marcus & Millichap
- Morgan Stanley Wealth Management
- NBS Financial Services
- Northwestern Mutual Financial Network
- The Otto Law Group, PLLC
- Pacific Project Management (PPM)
- Peterson Sullivan LLP
- Piper Jaffray
- Reed McClure
- Robert Half International
- Root Sports
- Seattle Bank
- Seattle Mortgage Company
- Swedish Medical Group
- Wedbush Securities
- Williams Kastner
- Willis Towers Watson
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