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.