Views aggregation missing in LDAP query

I've created a View using my LDAP Query as a source and the view works great -- however, because my LDAP query is selecting all offices (physicaldeliveryofficename in Windows Active Directory) there are duplicate offices returned, as there are multiple users in each office. I was planning on using Views aggregation to apply a DISTINCT to the query, but for some reason that option is not available when selecting LDAP Query as the content source.

I realize that I could theme the output using PHP and strip out the duplicates that way or hide the output from display and do the same thing using PHP in the view's footer, but that doesn't seem like a very elegant solution when a DISTINCT would solve the problem in a much simpler way.