Washington State Convention Center Addition Co-Development

Seattle, Washington

Project Size:

940,800 square feet

Project Status:

Anticipated Completion 2022

LEED Status:

Targeting LEED New Construction Silver


Urban Design, Urban Mixed Use Design


The 13 most important construction and development projects in the United States

Curbed, 03/01/2017

The Washington State Convention Center is located in the heart of Seattle’s downtown core.  As a result, the site for the original facility and each subsequent expansion has been vested with significant and valuable development rights, much of it unnecessary for the development of the convention center.  In order to maximize development potential and enhance available funding sources, synergistic development opportunities have been pursued in the air-rights above the convention center.  The resulting increased density co-development brings to the project enhances the pedestrian experience and vitality of the surrounding neighborhood.  Co-development projects have included a hotel and office building in the previous expansion and residential and office towers with street-front retail in the current addition.

Site and Program
The planned 1.5-million square foot addition to the Washington State Convention Center occupies two full city blocks above grade and four blocks below grade, including two subterranean street vacations.  The larger below-grade footprint is necessary in order to accommodate the program for the exhibit hall along with adjacent loading dock and support areas.  Above grade, two mixed-use co-development projects are located above the below-grade loading docks of the convention center addition, each encompassing one city block with a vacated alley.  The program for the co-development projects include an office tower and a residential building, each rising above street-level podiums with retail and pedestrian oriented street-level uses.

The office building will consist of a 16 story, approximately 542,000 SF commercial building above 12,000 SF of retail space. At ground level, highly-glazed retail spaces line Howell Street wrapping the corners at Terry and Boren Avenues with direct access from adjacent sidewalks.  Street level retail surrounds an internal loading dock for the office building as well as the freight truck ramp providing truck access to the Convention Center Addition loading areas below.

The residential building will consist of a 29 story, approximately 362,000 SF tower including 404 residential units and approximately 17,300 SF of amenity/recreational space. Additionally, the project contains 7,500 SF of retail space at the ground floor. Along 9th Ave, retail spaces spill out onto a dedicated public plaza. A portion of this plaza is a multi-story high space under the podium portion of the tower, proving weather protection for retail users and plaza users alike. The street level along Olive Way is primarily an all-glass façade with dedicated openings to access retail/amenity spaces and the residential lobby.