By Stephanie Taylor THE CANADIAN PRESS OTTAWA- Turning Rideau Cottage into the permanent residence of the prime minister would come at the cost of creating staff offices and other “residential infrastructure,” an internal government document says. Prime Minister Justin Trudeau has been living in the house on the grounds of Rideau Hall, the Governor General’s residence, since he came into office. Making that situation more permanent is one of three options the government is considering as the historic home for Canada’s prime ministers, 24 Sussex Drive, sits in disrepair after decades of neglect. The saga over what to do next lands in the middle of a cost-of-living crisis, as the Liberals struggle to soothe Canadians’ anxieties about affordability and are chided by the Opposition Conservatives for their spending. “Any decision…