1 Cal Plaza

1 Cal Plaza, formerly known as One California Plaza, is a 176 m skyscraper located in the Bunker Hill District of downtown Los Angeles, California, United States. With a second skyscraper, Two California Plaza, it comprises the California Plaza project. The Plaza also is home to the Los Angeles Museum of Contemporary Art, Colburn School of Performing Arts, the Los Angeles Omni Hotel, and a 1.5 acre water court.

Completed in 1985, One California Plaza has 1.05 e6sqft of office space. The towers were designed by Arthur Erickson Architects and named BOMA Building of the Year in 1989.

California Plaza was a ten-year, $1.2 billion project. Started in 1983, the Two California Plaza tower was completed in 1992 during a significant slump in the downtown Los Angeles real estate market. The tower opened with only 30 percent of its space leased and overall vacancy rates in downtown office space neared 25 percent. It was nearly 10 years before significant tall buildings were completed again in downtown Los Angeles. Several clear shots of the building under construction can be seen in the 1983 action helicopter movie Blue Thunder.

California Plaza was originally planned to include three high rise tower office buildings instead of the two completed. Three California Plaza at 65 floors, was planned for a site just north of 4th Street, directly across Olive Street from California Plaza's first two office highrises and was planned to house the Metropolitan Water District's permanent headquarters.

The construction and $23 million cost of the MOCA Grand Avenue building was part of a city-brokered deal with the developer of the California Plaza redevelopment project, Bunker Hill Associates, which received the use of an 11 acre, publicly owned parcel of land.

One California Plaza was purchased on June 6, 2017 by a partnership between Rising Realty Partners and Colony Northstar, Inc.

Tower One was featured in the Nickelodeon television show Drake & Josh as Spin City Records in the episode "Really Big Shrimp".