^^^There's a lot more remaining than people realize. Some of it has been covered up by ugly modern facades (the 60's were a period in which a lot of that was done) and a few of those are now being stripped off such as at the DeYoung Building, now reborn as the Ritz Carlton Residences.
Here is a photo (taken by me) of the DeYoung showing 2 sections of the brick facade that have been restored with a section of the unrestored brick between them after the ugly 60's cladding has been stripped off:
And this photo (also by me) shows some of the buildings wonderful brick detail:
I think there are a lot more such gems under 60s sheet metal around town besides the ones just hidden by larger modern structures.