Cal/EPA Building, Postmodern office building in Downtown Sacramento, United States.

The Cal/EPA Building is a postmodern office structure with 25 floors in Downtown Sacramento. The building provides approximately one million square feet of workspace and houses the California Environmental Protection Agency headquarters.

The structure was completed in 2000 and named after Joe Serna Jr., a former Sacramento mayor. Its completion marked a significant moment for downtown development in the city.

The building is also known as the Joe Serna Jr. Building, after the late mayor of Sacramento. It stands across the street from Cesar Chavez Plaza and Sacramento City Hall, and about 3,500 people occupy it on a working day.

The tower stands at 372 feet with 25 floors and sits across the street from Cesar Chavez Plaza and Sacramento City Hall, so the surrounding blocks are walkable from downtown transit stops. It serves about 3,500 people daily as the Cal/EPA headquarters, so expect a working government office rather than a visitor attraction.

The 96 out of 100 is the U.S. EPA's ENERGY STAR score for the building, while the separate 2003 ENERGY STAR award named it the most energy-efficient high-rise in the nation. Solar panels on the roof generate electricity without noise, a detail easy to miss from street level.