In the 1955 aerial the plumbing supply building has a peaked roof and rail sidings, this slightly curved structure is about three times as deep as the original freight station as well as being much longer. The next shot where it's clear is 2003 and shows what's there now, a flat roofed block structure with about the same footprint.
It's possible the peaked roof structure was built at the same time the main line was relocated to the south, I am not sure exact dates. it would have been a large addition to the original structure.
But the station this thread discusses is the original bit that was on the very east end, which was wood and well predates 1951, probably built by the Rome, Watertown & Ogdensburg when they built down to here. Early topos show a turntable and presumably engine facilities roughly where Freedom Plaza's structures are now.
This structure was removed approximately 2010 and the replacement is not as long, presumably eliminating the odd angled wall. None of the 2003-2009 photos show signs of it being burned.