Loos made a formative sojourn to the U.S.A. between 1893 and 1896 but I could find no mention of San Francisco being part of his itinerary during his stay. If he had visited the West Coast he would certainly have been struck, as I was, by A. C. Schweinfurth's 1896 Hearst Building, home of the San Francisco Examiner, and M. H. de Young's Chonicle Building across the street completed by Burnham & Root in 1889. He would already have been well versed in the Chicago-based firm's work and would have noted its structural similarities with the Monadnock Building. Upon completion of the nearby Spreckels Call Building in 1898 the complex intersection of Third, Market, Geary and Kearney Streets became known as "Newspaper Angle" (see below).
The 1922 Chicago Tribune Tower competition was also being closely followed by Schindler and fellow Loos protege Richard Neutra. They would have gotten the likely joke intended by Loos over his entry based upon their knowledge of Loos's idol Louis Sullivan's loathing of the Doric column. (For much more on this see my "R. M. Schindler, Richard Neutra and Louis Sullivan's"Kindergarten Chats").