Mong Kok Police Station / Former Police Training School [1925- ]
Notes from Moddsey:
As far as I know, the former Police Training School in Kowloon was at Mongkok Police Station.
Notes from Ho Lim Peng:
I think the building is the old Police Training School at Mong Kok. This building later became Kowloon Police Headquarters, and I think it is still there, near the main Mong Kok Police Station building.