The Bank of California Building, also known as the Durham & Bates Building and currently the Three Kings Building, is a historic former bank building in downtown Portland, Oregon, United States. It has been on the National Register of Historic Places since 1978. The three-story building was designed by A. E. Doyle in an Italianate style and completed in 1925. The ground floor features a two-story-high grand room with 36-foot (11 m) ceilings. The building's original owner and occupant, the Bank of California, moved out around the end of 1969 and sold the building in 1970. It has had a succession of other owners and tenants since then. It was last used as a bank in 1977.

The Union Bank Tower, formerly known as the Union Bank of California Tower and originally as the Bank of California building, is an 82 m (269 ft), 15-story office building completed in 1969 in downtown Portland, Oregon. It was briefly the tallest building in the city when it topped-out in 1968, but was soon eclipsed by the Georgia-Pacific Building.