Item 10638 - Board of Trade Building, Portland, 1907 Item 10638 - Board of Trade Building, Portland, 1907 Contributed by Maine Historical Society Item 10638 Zoom 3192px x 4669px - 10.6"w x 15.6"h @ 300dpi | Need a larger size? *Credit line must read: Collections of Maine Historical Society Image Info This building at 34 Exchange St., the former Merchants Bank, became the new home of the Portland Board of Trade in January, 1907. Show Details