Union Square, Dewey Monument, St. Francis Hotel [Union Squar, Stockton Street entrance to unique underground garage in foreground] [The world's largest underground garage, occupying four levels beneath the surface, can accommodate 1700 cars. It is to be used as an air raid shelter if it becomes necessary to do so. It has entrances on Post, Powell, Stockton, and Geary Streets.] - [Needs Transcription / inscription] (inscribed, postmark July 28, 1956)