Re: Crenshaw's swastika. Maybe or maybe not. It was widely used in other non political contexts before being taken up by the Nazi movement. The ad posted here dates from 1913, so it seems somewhat doubtful that there was a hidden meaning. On the other hand, I wonder just what kind of deed"restrictions" were in place on the land being offered for sale. I suspect there were some racial and probably religious restrictions regarding prospective buyers of those lots. Here is a somewhat informative history of the swastika that explains the history of the symbol in more detail.
http://www.ushmm.org/wlc/en/article....uleId=10007453