What about a repeat of the TAR2 clue, of going up the tallest building in Hong Kong?
The thing is, the IFC 2 has overtaken Central Plaza since a couple of years back, so this could definitely lead to a couple of Mary/Peach Central Plaza/Centre Building mistakes...
I've seen documentaries being filmed on the rooftop of the IFC before.
Not that Dustin/Kandice's lift looks anything like the one that goes up the IFC tower; if anything it's the IFC mall, which... doesn't make sense either...