According to Phil's Hong Kong & Macau Film Stuff site:
"Flat A3, 1/F, 67 Beacon Hill Road, Bik Wah Court (aka Beverly Heights): Betty’s home in 1973 where Bruce died/went comatose. [edit: Wolfgang has informed me that Betty's old flat in this building was actually on the 2/F, not the 1/F. I'm unsure if this means the flat number is also different...?]"
Have fun, been there already ;)