Old Telecom Compound, Telegraph Bay [????- ]
In looking for information regarding PB 004 I found this cable compound nearby.
The outline of the Cable Compound can be viewed from google street map.
Looking at the photo from Hedda Morrison the building also exists in the old photo of 'waterfall bay'. Note how the ground level has raised that perhaps also explain why the LL of PB004 still exists but PB 004 itself is gone.