John Langley Howard, 1935, at the De Young Museum. Howard's most famous works were [edit: some of] the murals in a well-known shrine to Liberal Fascism.
The intersection shown here no longer exists. When the Embarcadero Center was built (ca. 1970), it cut off Clay just past Drumm. In the '60s, they built the Embarcadero Freeway, with an
off on-ramp ending beginning right about here; after the Loma Prieta quake it was torn down, thanks to the vision of Mayor Agnos. The only element of continuity with the present day is the building in the background, One Market, seen here from the opposite angle:
Update: post revised upon clearer recollection of the geography. Also, I think it was the freeway rather than Embarcadero Center that originally cut off Clay from Embarcadero; Clay fed directly onto the freeway rather than going through. When they took down the freeway, they left Clay as a dead end.