Probably Hamilton's most popular example:
(not my photos, just click them to go to the photographer's flickr pages)
Although technically not Art Deco but rather Gothic, the Pigott building is of the same era of construction:
The Sun Life building beside it is a bit older I believe. It had a more detailed cornice piece that was dismantled at some point. They're both condo buildings now.
There are other examples in Hamilton but I don't have very good photos of them.