Union Square, San Francisco, California Postcard - Text on back: Union Square in San Francisco - Surrounded by tall buildings and world famous hotels, Union Square serves as the worldﾒs largest subterranean garage. Beautifully landscaped the surface appears as a park with the marble center shaft dedicated to Spanish - American War Veterans. The garage is four stories deep and is made of reinforced steel and concrete. Vintage postcard is unused and in good condition.
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