He seems to be at Montreal. In the link below, second photo down on the right hand side is an aerial view of Montreal old port - the middle section seems to be a good match for the background. Photo in the link is undated so its possible that the jettys were widened for double terminals, but i'm going on the large square door, 3 over door windows on the terminal, and then the storage buildings behind with semi circular upper edge windows.
A quick look suggests Southampton and Liverpool had very different layouts, and New York, despite having similar terminals does have a background full of tall buildings.
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