During the 1960s when Montreal's financial district shifted from its St. James Street center to midtown, The CIL House also became the annex headquarters of the Bank of Montreal when it added a main banking branch there. Then-named Dorchester Boulevard West became the financial center of Montreal and Canada with the largest Canadian banks and insurance companies having a presence. In later years, CIL moved its head office operations to Ontario. The Royal Trust later received naming rights to the building when it located its head office there until the merger with the Royal Bank of Canada. The name Royal Trust Tower now refers to another building in Toronto.