The Caltrans District 7 Headquarters building at 100 South Main Street in Downtown Los Angeles, California serves the California Department of Transportation and the Los Angeles Department of Transportation. Built on a $165,000,000 budget it opened on September 24 2004. Its futuristic and environmentally friendly design has won its designer Thom Mayne the 2005 Pritzker Prize. The design and construction of the building was documented across four episodes on the History Channel series Modern Marvels, to demonstrate the unique challenges presented in the design and construction of large buildings over the past two centuries.
The 13-story structure, bounded by First Street, Main Street, Second Street and Los Angeles Street, has 716,200 gross square feet for office spaces and an underground parking for 1142 vehicles. Special features include the public plaza named for Eli and Edythe Broad, Motordom, the unique glass floor of the third-floor conference room, Code: Survey, urban landmarks, and the Ten Past Five Oâ€™clock on the fourth floor.