400 Westlake

A redevelopment of the landmarked Firestone Building by Martin Selig Real Estate, 400 Westlake sets a new benchmark in sustainability and reduced energy consumption cost while delivering the greenest office building of its size in the world. 400 Westlake is composed of 15 floors of office space, two levels of underground parking, 9,000 square feet of retail space, a rooftop terrace and private decks, on-site shower facilities, bike storage, efficient side-loaded 15,000 SF floor plates, and full-height glass. 

400 Westlake achieved the Petal Certificate under The Living Building Challenge (LBC). Exceeding the LBC standards, the building generates more energy than it uses, providing cost savings for tenants while benefiting the environment. The property generates 105% of the amount of energy it needs and uses 35% less energy than a typical office building. In addition, 100% of rainwater will be saved and treated for onsite non-potable uses.

Furthermore, the building’s exterior is unified by a high-performance curtain wall that enhances the sculptural presence of the building’s shape and maximizes the benefit of natural light. 

400 Westlake’s prime location offers excellent access to I-5 and Highway 99, public transit, and bicycle paths for commuters. Surrounded by cafés, restaurants, and food trucks, tenants are just a short walk to downtown and the Lake Union waterfront. The building’s location within the neighborhood offers views of downtown, Lake Union, and Puget Sound.

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Status: Built
Location: Seattle, WA, US
Firm Role: Architect
Additional Credits: General Contractor / Construction Manager: Jim Lorenza, Project Executive, Lease Cutcher Lewis
Structural and Civil Engineer: KPFF
Mechanical + Plumbing: Key Mechanical
Electrical Engineer: Stantec
Lighting: Stantec
Landscape: Brumbaugh & Associates
Geotechnical: GeoEngineers
Energy Modeling: GlumacSpec
Writer: ABI
Historic Preservation: Peter Meijer Architects