The California Department of Transportation (Caltrans) District 7 Headquarters by Pritzker Prize winning architect Thom Mayne
is an illusive, ever-changing office building located in the heart of Los Angeles, California. The structure is wrapped in sheathing that opens and closes according to outside conditions. When the sun is bright, the building appears closed and windowless. At dusk the building seems nearly transparent. At night, the four-story lobby becomes luminescent.