I don't have anything particularly insightful or funny to say about the sign. But I will tell you 'SIGNS' gave me more pleasure than two hours of the Mel Gibson movie of the same name. Of course I'm a little biased and tend to poo-poo anything made by the height-challenged, Jew-hating Aussie.
By the way, behind the building you can see a cell-phone tower cleverly disguised as a faux palm tree.
I find those amusing as well.