This former dock building was erected in the 1880s and served as the long-time offices of the Mount Stuart Dry Docks Company Ltd. The offices were built alongside Graving Dock No.1, part of Cardiff Docks, built by the Marquesses of Bute. The now-demolished Mount Stuart public house stood just outside the dock gates. Both the dock offices and the pub were named after the Marquesses’ ancestral home on the Isle of Bute.