First, I would not be paranoid; I would feel safe.  

  What concerns me about this post, is that the lady who has never met you, has no issue allowing you past security.  When did she check your ID?  Also, who did you tell the desk you were visiting?  Did the lady give you her real name?  My front desk knows nothing of my alias.

  I live in a secure building, and all first dates are greeted in the foyer of the building.  This saves the gentleman from having to show his ID, and sign in at the front desk.  If he chooses to visit with me in the future, I leave his "name" at the desk, he can just come on up, as he will have my name.  

  Please do not flame me for giving out my real info, but since I have the gentleman's, it's only fair he has mine.  I assure you, if a gentleman wants to find out your true identity, he can.  I work part time in the private sector, and visit with a few gentlemen per week, so there is not a steady stream of traffic to my apartment.

Hugs and Kisses

a lady at her apartment.  Remember, you are business colleagues, were friends from the old neighborhood, went to school together, etc.  

I can see this becoming a problem when the lady continues to have 3-5 men visiting her most days of the week.  Unless the security guy gets a cut or a freebee, he may be inclined to notice.