James Vernor died October 29, 1927, and was succeeded by his son, James Vernor Jr. Expansion continued throughout Prohibition. Just prior to the onset of World War II, Vernors built a bottling plant and headquarters, encompassing an entire city block on Woodward Avenue, one block from the Detroit River. In the late 1950s, when the City of Detroit proposed construction of Cobo Hall and other riverfront projects, a land-swap was negotiated, and Vernors moved its bottling plant and headquarters to the location of the old civic exhibition hall at 4501 Woodward Avenue, incorporating many of the popular features of the old plant. Tours of the Vernors plant old and new were major tourist attractions. In 1962, Vernors introduced Vernors 1-Calorie, now called Diet Vernors.