In the back of this shot (above) you can see the 'Pink House' - currently HSBC senior staff quarters.
Actually, Cameron Mansions has another link to the film world because it was supposedly designed by local architect, Kwan Wing-hong, who happens to have been the father of Nancy Kwan. I've heard this rumour before but can't seem to find a source to back it up at the moment. I'll dig deeper and update later.
Anyway, the building was completed in 1951 and constructed on the remains of a large concrete base that formerly supported the (in)famous Japanese war memorial - erected during the occupation. According the post-war news reports, the site had been constructed for the purpose of mass suicide by the Japanese forces in case the British were able to re-invade Hong Kong. I guess they had second thoughts.
The memorial was destroyed soon after the war ended but rumours persist about a valuable ceremonial sword that was embedded into the foundation base as some sort of consecration. It may or may not be true but I suspect it will remain out of reach until the time comes for redevelopment of the site.