Standard Plaza is a 16-story office building in downtown Portland in the U.S. state of Oregon. At 222 feet in height, it was the largest office building in Oregon when it was completed in 1963. The 217,000-square-foot structure, occupying a city block on SW 6th Avenue between Main Street and Madison Street, is owned by Standard Insurance Company, which also owns the neighboring Standard Insurance Center. It was designed by Skidmore, Owings and Merrill in the international style.