Infernal Affairs - Andy Lau (2002) - Connaught Road, Central

Chan is called on the phone by his police boss and told to find out who the police mole is. He takes the call on the walkways that straddle the Hang Seng building and One IFC. This is the same location used in 2013 for the car bomb and gunfight scene in Blackhat, although that film wasn't released until 2015.