The Taxi Driver - David Chiang (1975) - Observatory Road, Tsim Sha Tsui

The bad guy's girlfriend (played by Terry Lau) lives in an apartment on Observatory Road. There are very few roads in Kowloon that are this steep so narrowing down the location was a bit more straightforward (I had no clue where this was 10+ years ago when I first covered the film).

The ornate looking building on the corner was the Luna Building. It has previously been featured, very briefly, in The Peking Medallion.

The Peking Medallion - Robert Stack (1967) - Kimberley Road, Tsim Sha Tsui

Stack's hotel is called the Paloma Hotel but we're not told where it is. However, a quick bit of investigation shows that it is most likely Kimberley Road thanks to the sign on the outside of the building that shows its real name - although it's only at a later point in the film when this is revealed (see the bottom picture). The Luna Building: 月仙樓.

This grand old building doesn't exist anymore and it's replacement, Luna Court, a modern residential unit, was built in 1988. More interestingly is the row of tenements on the other side of the road because a couple of these still stand today at 42-44 and 50-52 Kimberley Road.