400 Westlake Wins CoStar Commercial Development of the Year

Developer Martin Selig Real Estate describes 400 Westlake, its office tower redeveloped within the shell of the historic Firestone Building in Seattle’s South Lake Union district, as “the greenest building of its size in the world.” The Seattle-based company focused on sustainability, technology and climate change mitigation in the 400 Westlake‘s design, which includes a 107,000-gallon water storage tank to capture all the rainwater that falls on the building in one of America’s wettest cities. The project’s blending of modern, eco-friendly design with historic preservation in the heart of Seattle tech hub earned 400 Westlake a 2024 CoStar Impact Award, as judged by real estate professionals familiar with the market.