Swastikas are historically very common, to the ironic extent that they've even been found in the remains of at least one ancient synagogue. And, no, I'm not kidding.
I doubt that the presence of swastikas in 450 Sutter Street means anything at all. It's not as if this is the only modern building to include them. Or to have included them. The New York Presbyterian Hospital used to have swastikas, but they were converted to Greek crosses in 1938. (I got that from the WPA guide to New York City, BTW.)
Last edited by MeddlingMonk; 08-30-2012 at 10:58 PM.