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February 12, 2021
The Port of Seattle selected The Miller Hull Partnership and Woods Bagot as architects on a $340 million addition to Sea-Tac Airport's C1 Building at the intersection of the C and D concourses.
In press materials, the firms said they are the joint project design leaders and will create “an amazing destination retail experience using a rich array of local shopping and dining options.”
Turner Construction is the general contractor/construction manager on the design-build project, which is expected to start construction in the fourth quarter of 2022 and be complete in the second quarter of 2027.
An airport spokesman said the port had wanted to have the architect and contractor hired at the same time but in negotiating contracts it took a little longer to finalize the designers.
The expansion will be a four-story addition of 110,000 square feet to the existing 99,000-square-foot building, which is two stories with a basement.
Renovations will be made to the below-grade baggage level, the at-grade bridge level and the concourse levels that are all above grade. New dining and retail spaces will be added at the concourse level along with new seating and a 1,300-square-foot expansion of the adjacent Gate C3 waiting area. There also will be a new mechanical penthouse, as well as a loading dock with trash compactors.
About 40,000 square feet will be reserved as office and lounge space in new and existing levels, including 7,000 square feet for lounge operators on the new levels. Other elements of the project include a post-security meditation room, a room for nursing mothers and new restrooms.
Existing baggage operations, at the baggage and bridge levels in C1, will be replaced by a centralized baggage system that is being built in three phases. PCL Construction Services last year finished the first phase, which is below the central terminal. Phase two improves baggage systems to the north and phase three improves systems to the south.
New offices and storage will be built on C1's baggage and bridge levels, with space for Transportation Security Administration's central monitoring operations. The existing concourse level will get additional concession space and a new mezzanine level will add to the dining and retail mix.
Levels 1-3 above will have offices and lounge space. A long skylight will channel light into a five-story atrium.
The exterior of the addition will likely be a combination of metal panels and glazed curtain wall similar to existing airport buildings.
The expansion is the first project to implement the port's new Sustainable Project Framework. Targeting LEED Silver certification, the framework supports early integration of sustainability in capital projects with a view to meeting the Century Agenda goals.
Funding for the project will come from the Airport Development Fund and future revenue bonds.
The project team includes Magnusson Klemencic Associates, structural/civil engineers; PAE, mechanical, plumbing and sustainability engineers; Arup, electrical engineering, smoke control, airfield and logistics; AirProjects, airport dining and retail consultant; Moye Consulting, IT and security; Mayer/Reed, wayfinding and signage; Jensen Hughes, code compliance and fire protection; Dark|Light, lighting design; The Greenbusch Group, noise and vibration and vertical transportation; Hart Crowser, geotechnical engineer; Cumming, cost advice; Code Unlimited, accessibility/ADA; and Holt Services, site investigations. The Miller Hull Partnership is an architecture, planning, urban and interior design firm with studios in Seattle and San Diego. It is known for sustainable design.
Woods Bagot is a global multi-disciplinary architectural practice whose portfolio includes aviation projects.