Congress Center, Office building in Portland, United States.

Congress Center is a 1980 office building in Portland, Oregon, designed by Skidmore, Owings & Merrill. Its dark reflective glass curtain walls contrast with the city's mostly white or lighter-colored architecture and mirror nearby structures such as 1000 Broadway, the Portland Building and the Multnomah County Courthouse.

Construction began in 1978 and the building opened in 1980 as the Orbanco Building, named for its largest tenant, Orbanco Inc., whose subsidiaries Oregon Bank (founded 1887) and Northwest Acceptance Corporation were to be headquartered there. Oregon Bank moved in from another downtown location in March 1980. Renamed Security Pacific Plaza in April 1989, then 1001 Fifth Avenue in 1994, it took the name Congress Center in January 2002, after the Congress Hotel that stood on the site from 1912 to 1977.

The name Congress Center comes from the Congress Hotel, which stood on this site from 1912 to 1977. Terracotta arches salvaged from that hotel were restored as the entrance to a lower-level restaurant, so a piece of the old hotel remains visible at street level.

The tower stands at 1001 Fifth Avenue, between Southwest Main and Salmon streets, a short walk from the Pioneer Courthouse Square transit hub. Its dark glass curtain walls mirror 1000 Broadway, the Portland Building and the Multnomah County Courthouse, so the reflections are easiest to see from the sidewalk across the street.

Original terracotta arches from the previous Congress Hotel were preserved and integrated into the entrance of a lower-level restaurant space. These salvaged elements directly connect the modern structure to its hotel predecessor.