"Completed in 1971, the Weyerhaeuser Corporate Headquarters building in Federal Way, Washington — often called a "skyscraper on its side" — is composed of gently sloping landscaped terraces that step upward. At each level, deeply recessed windows run continuously along each side of the building, uninterrupted by wall surfaces or metal dividers. With lush vegetation spilling over the terrace walls, the building appears to merge with the surrounding environment. Weyerhaeuser Corporate Headquarters was the fourth SOM project to win The American Institute of Architects’s 25-Year Award when it was recognized in 2001."