The Taxi Driver - David Chiang (1975) - Tsan Yung Mansions, Homantin

The film uses a real life company, The Blue Taxicabs Ltd, as the company for who Chen works for. Formerly based on Nathan Road, the company built and then moved into the Tsan Yung Mansion building in the mid-1960s. The building is still around but the company has long departed - like many other companies in Hong Kong, property development and the vast amount of money to be made doing it lured many away from their traditional industries. Anyway, if you want to read more, Huw Farmer's excellent Industrial History website has an article or two.

The Young Rebel - David Chiang (1975) - Waterloo Road, Ho Man Tin

I can't confirm the location of the grocery shop where Xiao Rong works (edit: see Rodney's comment below confirming it was at 63a Waterloo Road), but as he departs for his first delivery we can see this was shot on Waterloo Road opposite Ho Man Tin Street. The building with the curved facade in the background is Tsan Yung Mansion and is still located on the corner of Waterloo and Ho Man Tin Street. I removed my posts sometime ago due to low picture quality (taken from a VCD), but I had previously covered The Taxi Driver on ths blog and that building was the HQ of the Blue Taxi Cab Company who David Chiang works for in that film. I'll redo that film if it makes an appearance on the Shaw Bros channel as it had some interesting locations.

All About Ah Long - Chow Yun Fat (1989) - Hong Garden, Ho Man Tin

Throughout several flashbacks, Sylvia and Ah Long recall the circumstances of their failed relationship from ten years before. In one scene, Sylvia is kicked from the family home by her mother and is picked up by Ah Long. The location of Sylvia's home is Hong Garden on Ho Man Tin Street. You can see the building name (康園) on a sign next to the main gate. It looks more or less the same today. The only thing that has changed is the metal gate.