Based on its latest 2012 financials just announced, NAV is HKD 58.5 per share. So the current price at HKD 31.6 implies a 45.9% discount to NAV.
What we know about the Lo Family is that they are great at buying at maximum pessimism, featured by buying the Great Eagle Building in 1989 and Langham place in 2003.
They have a history of paying a special HKD 5.1 per share dividend in 2006 on the back of the spin off of HK2778.
As always, the market can be unpredictable, so setting a sensible stop loss is prudent.