All I will have to say to the management, and the security guard is "GOTCHA, n00bs!. So much for your narrowminded management". I will, in fact, be kind of happy for the photographer, even though what he did was wrong, so to speak.
Such stereotyping of DSLR = pro must stop. Sadly, no matter how much the photographers speak up, the people upstairs refuse to listen.
However, when they ask me to delete a photo of their building "just because like that lor" and not because it is a matter of nat'l security or internal affairs (i.e. shooting a photo of US Embassy), when I am standing OUTSIDE the buildling, then they have no right to do that because I am not within their property.