 By the 1970s, the Crown began purchasing other structures or leasing space deeper within the downtown, civic area of Ottawa.In 1973, the Crown expropriated the entire block between Wellington and Sparks Streets with the intent of constructing a south block for Parliament Hill.However, the government dropped this proposal and instead, constructed more office space in Hull, Quebec, such as the Terrasses de la Chaudière and Place du Portage.