Item 85526 - Marr property, Summit Avenue, Great Diamond Island, Portland, 1924 Item 85526 - Marr property, Summit Avenue, Great Diamond Island, Portland, 1924 Contributed by City of Portland - Planning & Development Item 85526 Zoom 4752px x 3502px - 15.8"w x 11.7"h @ 300dpi | Need a larger size? *Credit line must read: Collections of City of Portland - Planning & Development Image Info Summer Dwelling at Summit Avenue in Great Diamond Island, Portland, was owned by Sherman L. Marr in 1924. Show Details