Oldboy: Wierd-ass movie

Go watch this oddball movie, if you haven't already. If for no other reason than that you get to see a live octopus eaten. Also, almost randomly, there was an allusion to the 1999 wierdo-cult hit Being John Malkovich: A character mentions his discreet "7.5" floor business, where the anonymity of clients is top-priority. If you have seen BJM, you will recall that the porthole is in an office which is on floor 7.5. I was just wondering if 7.5 is standard nomenclature for discreet businesses, or if this was a deliberate reference to the other movie.