400 Westlake

Project Details

Developer: Martin Selig Real Estate
Contractor: Lease Crutcher Lewis
Architect: Perkins + Will
176,000 SF Office 
7,500 SF Retail
Expected Completion: Q4 2019
Location: Seattle, WA

Energy Performance: International Living Future Institute - Energy Petal Certification

The 400 Westlake Building is a part of Seattle’s Living Building Pilot Program, which sets stringent sustainability standards for new and existing construction. Requirements include achieving Living Building Petal Certification in addition to using less than 75% of allowable energy use in the Seattle Energy Code, and collecting rainwater for use in all non-potable water uses such as flushing toilets and irrigation. The landmarked 400 Westlake site was formerly the Firestone building for the last 90 years and will become one of the greenest buildings in the world of its size. 

Solar panels will be installed on both the roof of the building and at an off-site location in Eastern Washington that will feed renewable energy back into the regional grid. The panels will help produce more energy than the building consumes, making it a net-positive building. The building utilizes a triple-glazed exterior window system for increased insulation. 

Green features include:

  • Energy production (on-site and off-site) must offset a predicted EUI of 28

  • Renewable energy production produces 105% of the project energy requirements, using on-site PV at optimal solar exposure, and off-site PV in Washington State equal to the area of 5 ½ rooftop arrays

  • The building will consume at least 25% less energy than Seattle Energy Code

  • Photovoltaic panels collect energy during all daylight hours

  • Structural design to provide access to natural daylight in all interior spaces, including stairwells

  • A high-performance curtain wall system enhances the passive performance of the building

  • Building water will be recycled to satisfy non-potable water needs and all stormwater is mitigated on site

  • Open-space, landscaped roof terrace (3,500 sf) on the top level


Renderings courtesy Perkins +Will