| 1021 O Street | |
|---|---|
 | |
 | |
| Alternative names | Capitol Annex Swing Space |
| General information | |
| Status | Completed |
| Type | Office |
| Architectural style | Modernism |
| Address | 1021 O Street |
| Town or city | Sacramento, CA |
| Country | United States |
| Coordinates | 38°34′30″N 121°29′42″W / 38.575001°N 121.495082°W |
| Current tenants | California State Legislature, Governor of California |
| Groundbreaking | 2019 |
| Completed | 2021 |
| Opened | 2022 |
| Cost | $430 million |
| Technical details | |
| Floor count | 10 |
| Floor area | 478,000 square feet |
| Lifts/elevators | 6 |
| Design and construction | |
| Architecture firm | HOK |
| Developer | State of California Department of General Services |
| Main contractor | Hensel Phelps Construction |
| Other information | |
| Public transit access | Archives Plaza station |
1021 O Street is a 10-story office building located in downtown Sacramento, two blocks south of the California State Capitol. Currently known as the Capitol Annex Swing Space, the building was built to house offices for the California State Legislature, the Governor of California, and other state officials during the replacement of the Capitol Annex, a 1952 office building attached to the east side of the Capitol.