@evilApostate: that can be the case. I found out that they move their operations (or some of it) to the 19th floor of an office building (check here: http://wol.jw.org/en/wol/pc/r1/lp-e/1200272761/15/0)
I found another piece of news that reports on this story: http://www.scmp.com/property/hong-kong-china/article/2022895/prime-site-kowloon-tongs-beacon-hill-expected-sell-more-hk7
Apparently the former branch buildings are prime property (I think they are making good money from moving the branch out of it).
I'm not in HK (or near) so I'm just sharing what I found on the news. Maybe someone closer to it can provide some details.