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As time went on more space was needed for trucks, since there was only one doorway, on the lower left. Eventually another hall was built and the original was mothballed. Now it's gone, but you knew that if you went to the picnic last year.
Now the site of Williams Hall bears a marker with a plaque on the back - gone but not forgotten. While demolition by neglect still irks me, it's not uncommon, unfortunately. The Buffalo Memorial Auditorium being another example of this mindset, as well as the grand interior of the no longer used entrance to the Buffalo Science Museum (at least that may be renovated).
The picture of Williams Hall is also a reminder to take photos of historic buildings while you can. You never know - one day you may show up to capture an image for posterity, camera in hand, and find out it's gone. I should know, because it happened to me.