Ian:
Mr. Robertson did tell us, once we had started building the course, that he would like to have a professional event there at some point and that we should build some tees in anticipation of such an event.
In most circumstances I do not take those comments too seriously, because most clients don't understand the financial, logistical and political realities of which courses are chosen to host a professional event. But, Mr. Robertson clearly understood them, so I had to take him seriously. We started immediately looking for a few tees I couldn't play from, and we kept at it until Michael Campbell came out to hit some balls in the dirt and told us we had done enough!
(Incidentally, the tee on #16 was one of those new tees ... it was originally to have been the back tee on a long par-4, but we changed the hole to a par-5 when Josie Robertson suggested that everyone should get to stand on that spot.)
What we didn't do was narrow up the course. The pros played it at the full width, and they seemed to enjoy smashing their drivers around it, even though two of the four did not break par.