I'm not sure what that building is - it's no longer there. When I signed on at Cardiff in 1964 it was in a very grand Victorian building just outside the main dock gates, that building is still there, boarded up and been For Sale for years - they're obviously asking too much for it.
The photograph show the ships in the Roath Basin - no longer used except for visiting warships and sailing ships. Currently, behind where the ships are berthed is a block of waterside flats and apartments. To the left you can just see the start of the entrance to a disused dry-dock this has been retained as a 'feature' and has offices built alongside, designed to look like the side view of the upper decks of an ocean going liner. Then over to the right, just out of the picture, the BBC are building a huge drama studio complex where they'll film Dr Who, Casualty, Torchwood etc.
I visit this area regularly because it's the only place where I can photograph ships in the Roath Dock -through the fence!