Standard Plaza, High-rise building in downtown Portland, Oregon.

Standard Plaza is a 16-story office tower on a full city block bounded by SW Fifth and Sixth avenues and Main and Madison streets in downtown Portland. Skidmore, Owings and Merrill designed the 222-foot (68 m) steel and concrete building in the International Style, with an aluminum and glass skin. A 50-foot weather beacon tops it, bringing the total height to 275 feet (84 m).

The building was constructed in the early 1960s during Portland's downtown modernization efforts. It emerged from post-war development that transformed the city's central business district with contemporary office architecture.

The International Style building, designed by Skidmore Owings Merrill, represents the architectural evolution of Portland during the mid-twentieth century urban development.

Standard Plaza occupies a full block bounded by SW Fifth and Sixth Avenues and Main and Madison Streets, with the main entrance on SW Sixth Avenue. Its garage holds 265 vehicles and gained three Blink electric-vehicle charging stations in 2012. The interior offers one of the few unobstructed views of the Portlandia sculpture on the Portland Building opposite.

A 50-foot weather beacon tops the building, 275 feet above ground. Its 6-by-5-foot light glows red if the temperature is forecast to rise 5 degrees or more, green if within 5 degrees, and white if it will fall 5 degrees; flashing means precipitation, steady means dry.