Seattle-Tacoma International Airport has revealed 30% design renderings of its next marquee capital improvement project. The C Concourse Expansion will elevate SEA, literally, by adding four additional floors above the existing building and raising the bar on the airport experience and sustainability. The project spans the C and D Concourses with 145,530 more square feet of dining and retail, sought-after amenities such as an Interfaith Prayer and Meditation Room and Nursing Suite, and an all-new, more than 20,000 square foot Alaska Airlines Lounge.The heart of the space, The Grand Stairs at C, will be an iconic destination that invites travelers to linger with seating, airfield views, music and art, or head upstairs for more elbowroom and dining and retail options. The expansion also encompasses office space for airport businesses, airlines, and the TSA. The C Concourse Expansion rethinks the airport experience where design creates an intuitive journey, a sense of calm, and climate consciousness. Miller Hull and Woods Bagot are leading the project’s design concept of bringing in and seeing out to create interplay of environments between the natural landscapes of the Pacific Northwest and the energy and vibrancy of Seattle. The forests of this region inspire the building's design. From the light solariums and the canopy feeling of the Grand Stairs, created by undulating Douglas fir coffers in the ceiling transition down to a singular colossal pillar, travelers will sense the scale and grace of a Pacific Northwest forest. The Grand Stairs create a central gathering space designed to reflect regional public and farmers markets. Dining and retail will frame this tiered, open amphitheater with a stage for live music. Next, travelers are drawn to the upper level with restaurants above as well as views and the ability to look out over the entire facade. One of the most unique aspects of the C Concourse Expansion is its height and unobstructed views of the airfield and Olympic Mountains via a lookout deck encased in glass that will be available to all passengers.