According to the dates on these two articles, it's sometime between May & June of 2016, at least for the table games. Sounds like it was more of a phased/soft closing, with pieces being shut down over time. Sounds like some of the slots may remain indefinitely.
http://vegas.eater.com/2016/5/5/11595170/westin-las-vegas-to-dump-the-casino-and-add-a-restaurant
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