The Old Capitol Building is a building in Olympia, Washington. Designed by Willis A. Ritchie, it was built from 1890 to 1892 as the Thurston County Courthouse, and served from 1905 until 1928 as the state capitol, seat of the legislature of Washington; in 1928 the legislature moved to the current Capitol Building. It is now the office of the Superintendent of Public In…The Old Capitol Building is a building in Olympia, Washington. Designed by Willis A. Ritchie, it was built from 1890 to 1892 as the Thurston County Courthouse, and served from 1905 until 1928 as the state capitol, seat of the legislature of Washington; in 1928 the legislature moved to the current Capitol Building. It is now the office of the Superintendent of Public Instruction.