In the 1950s senior management at B/A became more integrated with Gulf Oil Corp as Gulf's ownership increased. New refineries were opened in Edmonton and Moose Jaw, and the company's tanker fleet expanded to 22. B/A constructed a new eight-storey headquarters building in Toronto. In 1955 the company's oil production reached a record 10.5 million barrels and its reserves of 113 million barrels of crude oil and 404 billion cubic feet of gas, with the total annual refinery output exceeding 33 million barrels.
