Checked ebird and there hasn't been any spottings in the east bay and only a few in southern part of the bay a few years ago. I remember an email but not in the east bay.
Liam the major difference I saw from the previously spotted Brewers Blackbirds was that this bird was not as shiny.
I will update it as Brewers for now.
The "rusty" coloration in photo 2 looks like noise pixels from the camera to me, not actual feather pigment.
A shot of the tail would be definitive, though.
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