The Interurban Building, formerly known as the Seattle National Bank Building (1890–1899), the Pacific Block (1899–1930) and the Smith Tower Annex (1930–1977), is a historic office building located at Yesler Way and Occidental Way S in the Pioneer Square neighborhood of Seattle, Washington, United States. Built from 1890 to 1891 for the newly formed Seattle National Bank, it is one of the finest examples of Richardsonian Romanesque architecture in the Pacific Northwest and has been cited by local architects as one of the most beautiful buildings in downtown Seattle. It was the breakthrough project of young architect John Parkinson, who would go on to design many notable buildings in the Los Angeles area in the late 19th and early 20th century.