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$399M C Concourse Expansion is a Go for Sea-Tac

Courtesy of Miller Hull

In a recent announcement by the Port of Seattle, it was revealed that the $399M expansion of the C Concourse at Seattle-Tacoma International Airport has received approval. This project will not rely on taxpayer funds but will instead be financed through a combination of federal airport development funds and future revenue bonds.

The major construction work for this expansion is set to commence in the first quarter of 2024 and will involve adding four additional stories to the existing three-story facility. The decision to build upwards is a crucial component of Sea-Tac's growth strategy, given its status as one of the most space-constrained airports in North America.

The general contractor for this project is Turner Construction, with architectural design led by Seattle based, Miller Hull, and Woods Bagot, based in Australia. This expansion is a part of the Port's broader five-year, $5.3 billion capital plan.

Within the new floors, one will be dedicated to office space, and the remaining three will house various amenities such as restaurants, retail outlets, lounges, outdoor viewing decks, spaces for interfaith prayer and meditation, and a performance area for live music. Additionally, the expansion will incorporate a high-performance air delivery system to improve indoor air quality.

One major highlight of the expansion is its integration of the Port's Sustainable Evaluation Framework, aligning with the Port's aspiration to become the most environmentally friendly and energy-efficient port in North America. The project includes several eco-friendly features, such as a rooftop solar photovoltaic array and the use of materials with reduced embodied carbon. Biophilic design elements, such as the incorporation of undulating Douglas fir panels, aim to connect travelers with nature and pay homage to the natural beauty of the Pacific Northwest.

The Port's estimate for the completion of the C Concourse project is in the year 2026.

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