The New York State Capitol, the seat of New York State government, is located in Albany, the capital city of the U.S. state of New York. The capitol building is part of the Empire State Plaza complex on State Street in Capitol Park. Housing the New York State Legislature, the building was completed in 1899 at a cost of US$25 million (equivalent to $711 million in 2015), making it the most expensive government building of its time. It was listed on the National Register of Historic Places in 1971, then included as a contributing property when the Lafayette Park Historic District was listed in 1978. The New York State Capitol was declared a National Historic Landmark in 1979.