These are the Grain elevators located in Port McNicoll.
The history is unknown to me, though i have found a connected CN bridge in Victoria Harbour dating 1935.
Recommended to bring multiple flashlights, and a stick for possible animal inhabitants. I do not know of anyone getting up to top floor, but it is recommended to not attempt to climb, as the ladder anchors are letting go.
Best entrance is located mid way down the East side (staircase covered by a tree)