The Seattle District of the US Army Corps of Engineers has moved into a new headquarters building in south Seattle, Washington.
The 209,000ft² Federal Center South Building 1202 is located near the US Army Corps of Engineers old headquarters on East Marginal Way South.
It uses one fifth of the estimated energy for a standard office building in the north-west region.
The government expects the new $72m facility to be the region’s most energy-efficient air-conditioned building, using 100% outside air, underfloor ventilation and heat recovery optimised through the atrium.
To reduce its cooling needs, the facility uses ‘Phase Change Material’ that releases and stores cold-energy, while the structure combines the use of geothermal heating as well as cooling systems with structural piles.
The building’s U-shaped design allows the office floor plates to wrap around a central atrium which introduces biophilic design principles in addition to shared conference rooms and amenities.
Sustainable features of the facility include a rainwater collection system, which stores rainwater in a 25,000 gallon cistern for use in toilet flushing, irrigation, cooling, and landscaping.
Other sustainable features of the building include 300,000 board feet of reclaimed timber and a 50% reduction of impervious surfaces, creating 4.5 acres of pervious landscape.
The project is part of the US General Services Administration’s Design Excellence programme to promote sustainability, help communities and advance a clean energy economy.
US Representative Jim McDermott said, "With its innovative water capture and energy efficiency, the new district headquarters is a model for sustainable buildings."
Sellen Construction worked with ZGF Architects, which served as the lead designer, on the design build project.
The facility is expected to secure LEED Platinum certification from the US Green Building Council.
Image: The $72m, 209,000ft² facility is expected to be the north-west region’s most energy-efficient air-conditioned building. Photo: courtesy of US General Services Administration.