Found today (Tue Oct 09) around 1pm in Golden Gate Park. Described as - Overall bright and contrasty- very blue grey head contrasting with a green back, strong spectacles enhanced by a black line below and a dark forehead above, excessive lemon yellow on sides and vent, strong neat line between the white throat and malar, olive mixed with yellow on the sides later became apparent. Distinct white edge on outer tail feathers. Peter Pyle added- "This is an HY by the brown primary coverts contrasting with the replaced greater coverts and the tapered rectrices. So confirm HY male Blue-headed Vireo." Both attributes noted here: https://flic.kr/p/2bThnN8 Details and photos here: https://ebird.org/view/checklist/S49090918 Rudyard Wallen San Francisco
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