The boutique standard in South Lake Union

400 Westlake offers a high-performance office experience forged from the best of two eras. The building unifies an immaculately preserved 1929 blonde terracotta façade with light-filled glass upper levels, a thoughtful reimagining that infuses workspaces with a sense of curated warmth. 400 Westlake builds on a century’s worth of history with renovations that look ahead to the future, including upgraded amenities and award-winning sustainability features. And an address in the heart of South Lake Union offers more than rooftop water views. It places you blocks from many of the world’s foremost technology companies, including global leaders in AI, e-commerce, and consumer tech.