To clarify: yes, I agree, if it is dropping all of it's leaves, then we are probably not dealing with a camphor. But the poster is in redwood city, within camphor's limits in california,
and its shedding habits are close enough to deciduous trees it is hard to judge...
Lets wait for the smell test.
My point about hardy tropicals is that in regions of California, many micro climates predominate, and you will often get examples of one species of plant that will be deciduous in one region and evergreen in another. Or maybe you get that one in one-hundred years cold night that knocks all the leaves off (but does not kill) things like camphors and citrus and bougainvilleas in an area where they are widely planted....